body
Headache
Adverse effectHeadache is an unwanted outcome in which a person reports having a headache. In this context, it is treated as an adverse effect associated with an intervention, rather than a benefit or intended effect.
A focused look at Headache as a wellness topic.
These are research findings, not promises. Most options have little evidence, and results differ from person to person.
What can cause it
How likely each one is to cause it, most likely first.
Nasal Irrigation (Neti Pot)practicePossible
Based on 5 studies. Strongest study: a pooled analysis of several trials.
A pooled analysis of randomized trials in people with sinusitis included headache among several reported symptoms, alongside tearing, nosebleeds and nasal drainage. A later review also listed headache among a broader range of symptoms.
Open the Nasal Irrigation (Neti Pot) pageMindfulness MeditationpracticePossible
Based on 2 studies. Strongest study: a randomized controlled trial.
An RCT involving 61 people with a clinical condition reported headache or migraine.
Open the Mindfulness Meditation pageTranscendental MeditationpracticePossible
Based on one study. Strongest study: a randomized controlled trial.
A randomized trial in 2015 involving 17 people listed headache as an observed effect.
Open the Transcendental Meditation pageFastingpracticeUnclear
Based on 12 studies. Strongest study: a pooled analysis of several trials.
Pooled analyses whose designs were not recorded reported headaches with alternate-day fasting and mild headache in a separate analysis. The findings do not quantify how often headaches occurred.
Open the Fasting pageOzone TherapypracticeUnclear
Based on 6 studies. Strongest study: a pooled analysis of several trials.
A 2022 pooled analysis of randomized and non-randomized human studies reported headache. A 2024 pooled analysis also listed headaches alongside eye injuries and paresthesia.
Open the Ozone Therapy pageRed Light Therapy (Photobiomodulation)practiceUnclear
Based on 5 studies. Strongest study: a pooled analysis of several trials.
A pooled analysis of randomized trials reported headache, as did a 2024 pooled analysis of randomized and non-randomized human studies. The studies involved people with a range of conditions, including age-related macular degeneration, allergic rhinitis, chronic pain, depression, and Parkinson's disease.
Open the Red Light Therapy (Photobiomodulation) pageBreathworkpracticeUnclear
Based on 4 studies. Strongest study: a pooled analysis of several trials.
A pooled analysis whose study designs were not recorded associated minor adverse effects, including headache, with fast breathing, especially kapālabhātī. A 2024 review also described transient headache, nausea, or dizziness.
Open the Breathwork pageAcupuncturepracticeUnclear
Based on 3 studies. Strongest study: a pooled analysis of several trials.
Pooled analyses of randomized trials reported headache, while a systematic review reported giddiness and headache in studies involving allergies and Parkinson's Disease.
Open the Acupuncture page
The expert view shows every study, dose protocol and source.
What can cause it
Interventions reported to bring this on37 listedHighest probability
- →PracticesNasal Irrigation (Neti Pot)CertaintyMediumSourceClinical5 other sources
A pooled analysis of randomized trials in people with sinusitis included headache among several reported symptoms, alongside tearing, nosebleeds and nasal drainage. A later review also listed headache among a broader range of symptoms.
Who was studied
- People with a condition
- Sinusitis
Open Nasal Irrigation (Neti Pot)Study result
tearing, nosebleeds, headache, nasal drainage
- →PracticesMindfulness MeditationCertaintyMediumSourceClinical2 other sources
An RCT involving 61 people with a clinical condition reported headache or migraine.
- →PracticesTranscendental MeditationCertaintyMediumSourceClinical1 other source
A randomized trial in 2015 involving 17 people listed headache as an observed effect.
Low probability(34)(2)(32)
- →PracticesFastingCertaintyLowSourceClinical12 other sources
Pooled analyses whose designs were not recorded reported headaches with alternate-day fasting and mild headache in a separate analysis. The findings do not quantify how often headaches occurred.
Who was studied
- Healthy people and patients
- Diabetes Type2
- Fatty Liver Nafld
- Metabolic Syndrome
- Overweight
- Prediabetes
Open FastingStudy result
Headaches (ADF)
- →PracticesOzone TherapyCertaintyLowSourceClinical6 other sources
A 2022 pooled analysis of randomized and non-randomized human studies reported headache. A 2024 pooled analysis also listed headaches alongside eye injuries and paresthesia.
Who was studied
- People with a condition
- Covid 19
- Oral Lichen Planus
Open Ozone TherapyStudy result
Headache
- →PracticesRed Light Therapy (Photobiomodulation)CertaintyLowSourceClinical5 other sources
A pooled analysis of randomized trials reported headache, as did a 2024 pooled analysis of randomized and non-randomized human studies. The studies involved people with a range of conditions, including age-related macular degeneration, allergic rhinitis, chronic pain, depression, and Parkinson's disease.
Who was studied
- People with a condition
- Age Related Macular Degeneration
- Allergic Rhinitis
- Alzheimers Disease
- Anxiety Disorder
- Chronic Pain
- Depression
- +4 more
Open Red Light Therapy (Photobiomodulation)Study result
Headache
- →PracticesBreathworkCertaintyLowSourceClinical4 other sources
A pooled analysis whose study designs were not recorded associated minor adverse effects, including headache, with fast breathing, especially kapālabhātī. A 2024 review also described transient headache, nausea, or dizziness.
Who was studied
- Healthy people and patients
Open BreathworkStudy result
Minor AEs: anxiety, breathlessness, cough, dizziness, feeling of constriction, flashback, headache, neck pain (associated with fast breathing, especially kapālabhātī)
- →PracticesAcupunctureCertaintyLowSourceClinical3 other sources
Pooled analyses of randomized trials reported headache, while a systematic review reported giddiness and headache in studies involving allergies and Parkinson's Disease.
Who was studied
- People with a condition
- Allergies
- Parkinsons Disease
Open AcupunctureStudy result
Headache
- →PracticesCupping TherapyCertaintyLowSourceClinical2 other sources
A 2018 pooled analysis of randomized trials reported tension headache. A separate trial involving 50 people in 2011 reported slight headache.
- →PracticesMeditationCertaintyLowSourceClinical1 other source
A pooled analysis whose designs were not recorded described discomfort from heavy headsets and insufficient realism in virtual environments.
Who was studied
- Healthy people and patients
Open MeditationStudy result
headset discomfort (heavy headsets) and insufficient realism of virtual environments
- →PracticesYogaCertaintyLowSourceClinical1 other source
A review pooling studies whose designs were not recorded reported migraine or vertigo.
Who was studied
- People with a condition
- Back Pain
- Carpal Tunnel
- Frozen Shoulder
- Herniated Disc
- Neck Pain
- Rheumatoid Arthritis
- +1 more
Open YogaStudy result
Migraine / vertigo
- →PracticesInfrared SaunaCertaintyLowSourceClinical2 other sources
A 2025 randomized trial involving 30 people with Major Depressive Disorder recorded headache.
Who was studied
- People with a condition
- Major Depressive Disorder
Open Infrared SaunaStudy result
Headache
- →PracticesBinaural BeatsCertaintyLowSourceClinical2 other sources
A 2024 randomized trial involving 29 participants recorded headache.
- →PracticesIce Bath / Cold PlungeCertaintyLowSourceClinical1 other source
A review of randomized and non-randomized human studies reported headache or dizziness in connection with cold-water immersion.
- →PracticesHot YogaCertaintyLowSourceClinical2 other sources
A 2017 cross-sectional study of 700 reported headache.
Open Hot YogaStudy result
Headache
- →PracticesAnusara YogaCertaintyLowSourceClinical1 other source
A 2026 systematic review of observational studies classified reported events as neurological adverse events, without specifying whether headache was among them.
- →PracticesPilatesCertaintyLowSourceClinical1 other source
Headache was reported in a 2023 RCT with 58 healthy people.
- →PracticesForest Bathing (Shinrin-yoku)CertaintyLowSourceClinical1 other source
In a 2025 trial involving 36 people with hypertension, mild headaches were listed among transient effects, alongside dizziness, fatigue, and elevated blood pressure.
Who was studied
- People with a condition
- Hypertension
Open Forest Bathing (Shinrin-yoku)Study result
Transient dizziness, fatigue, mild headache, or elevated blood pressure
- →PracticesHot BathCertaintyLowSourceClinical1 other source
A case series described severe, sudden-onset headaches triggered by hot-water pouring or soaking in a hot bath in 3 people.
Who was studied
- People with a condition
Open Hot BathStudy result
Severe paroxysmal headache provoked by hot water pouring or hot bath soaking
- →PracticesFinnish SaunaCertaintyLowSourceReference knowledge2 other sources
Pharmacology references describe heat exposure, dehydration, and temporary blood-pressure changes as possible causes of headache during or after sauna use. Some people also reported this effect in community posts.
Open Finnish SaunaStudy result
Heat exposure, dehydration, and transient blood-pressure changes can produce headache during or after sauna use.
- →PracticesCardioCertaintyLowSourceReference knowledge1 other source
Pharmacology references note that hard effort can trigger an exertional headache, attributed to raised blood pressure and widened blood vessels in the head; heat or dehydration may make it more likely.
Open CardioStudy result
Hard effort can trigger an exertional headache, from raised blood pressure and widened blood vessels in the head, more so in heat or when dehydrated.
- →PracticesCoffee EnemaCertaintyLowSourceReference knowledge1 other source
Dehydration, caffeine exposure, or abrupt changes in usual caffeine intake may trigger headache.
- →PracticesLoving-Kindness Meditation (Metta)CertaintyLowSourceReference knowledge1 other source
Focused attention and tension in the face, jaw, or neck during practice can bring on a mild tension headache.
Open Loving-Kindness Meditation (Metta)Study result
Holding focused attention and tension in the face, jaw or neck during practice can bring on a mild tension headache.
- →PracticesStrength TrainingCertaintyLowSourceReference knowledge1 other source
Heavy lifting with Valsalva can trigger transient primary exertional headache in susceptible people.
- →PracticesMassageCertaintyLowSourceAnecdotal2 other sources
Some individuals experience a mild headache after massage, possibly due to dehydration, toxin release, or tension changes.
- →PracticesSwedish (Classic) MassageCertaintyLowSourceAnecdotal2 other sources
Rarely, massage can trigger a headache, possibly due to changes in blood flow or muscle tension release.
- →PracticesWim Hof Method BreathingCertaintyLowSourceAnecdotal2 other sources
Commonly reported after improper recovery phase; likely due to cerebral vasoconstriction from hypocapnia.
- →PracticesBedtime Wind-Down RitualCertaintyLowSourceAnecdotal1 other source
This effect was mentioned in 2 of 288 Reddit reports discussing it.
- →PracticesBrain Games / PuzzlesCertaintyLowSourceAnecdotal1 other source
Prolonged concentration or eye strain from screen-based puzzles can trigger tension headaches.
- →PracticesBrisk WalkingCertaintyLowSourceAnecdotal1 other source
This effect was mentioned in 2 of 235 Reddit reports discussing it.
- →SupplementsChagaCertaintyLowSourceAnecdotal1 other source
This effect was mentioned in 2 of 229 Reddit reports discussing it.
- →PracticesFocused Attention MeditationCertaintyLowSourceAnecdotal1 other source
This effect was mentioned in 10 of 237 Reddit reports discussing it.
- →PracticesQigongCertaintyLowSourceAnecdotal1 other source
This effect was mentioned in 4 of 250 Reddit reports discussing it.
- →SupplementsSea Moss (Irish Moss)CertaintyLowSourceAnecdotal1 other source
This effect was mentioned in 8 of 299 community reports discussing it (Reddit 4, YouTube 4).
- →PracticesThai MassageCertaintyLowSourceAnecdotal1 other source
This effect was mentioned in 2 of 262 Reddit reports discussing it.
- →PracticesVinyasa YogaCertaintyLowSourceAnecdotal1 other source
This effect was mentioned in 5 of 312 Reddit reports discussing it.
- →PracticesEar CandlingCertaintyLowSourceTheoretical1 other source
Smoke, heat, odor, pressure sensations, or anxiety during ear candling may trigger a headache.
How to read the evidence
Evidence tier — overall strength of the evidence for the whole compound
- StrongWell established — backed by strong, consistent human research.
- ModerateSome genuine support, but mostly from small or lower-quality studies. Promising, not proven.
- PreliminaryEarly-stage evidence — a promising hypothesis, not an established effect yet.
- LimitedVery limited evidence — treat this as a hypothesis, not proof.
- InsufficientNot enough good evidence to draw conclusions yet.
Certainty — how sure we can be that the effect is real
- Very highVery sure — strong, consistent evidence
- HighFairly sure — consistent evidence from good studies
- MediumModerately sure — new studies could change this
- LowNot sure — little or mixed evidence
- Very lowVery unsure — almost no usable evidence
Source — where the data comes from
- Meta-analysisPooled analysis of many trials — the strongest evidence
- RCTRandomized controlled trial — a strong human study design
- ClinicalA human clinical study
- Reference knowledgeFrom general health-science or pharmacology references, not a study of this exact claim
- Animal researchStudied in animals, not humans
- Community reportsAggregated user reports — anecdotal signal, not evidence
- TheoreticalMechanism-based reasoning, not yet tested
Study grade — quality of each underlying study (A best, D weakest)
- AHigh-quality — strong, consistent human trials
- BGood — solid evidence with some limitations
- CModerate — limited, small, or mixed-quality studies
- DWeak — preliminary, indirect, or animal-only
Confidence — how strongly the sources back a finding
A 0–100 score from study quality and agreement
Most supplement evidence is graded C–D. Read it as preliminary signal, not proof.
Full write-up
What is it
Headache is an unwanted outcome in which a person reports having a headache. In this context, it is treated as an adverse effect associated with an intervention, rather than a benefit or intended effect. Reports involving Potassium, Melatonin, Hyaluronic Acid, and Valerian Root illustrate interventions linked with this outcome.
How interventions help
These entries describe interventions associated with headache as an adverse outcome, rather than interventions shown to relieve headache. The evidence therefore concerns how headache may appear during or after use, and the entries do not establish that any of these options should be used to treat headache.
The circumstances differ. Some associations come from clinical comparisons in which headache was recorded during use, while others are based on reference explanations or anecdotal reports and offer possible contributing factors rather than a confirmed causal pathway. Dehydration and transient physiological changes recur across several non-supplement interventions, including Finnish Sauna, Ozone Therapy, and Cigarette Smoking. This means that timing around exposure and the surrounding conditions may matter, but the information does not establish a universal onset pattern.
Duration and administration also vary. Melatonin was evaluated at 0.15-15 mg/day over 1 week to 3 months, whereas Hyaluronic Acid was studied as 1-5 weekly injections; amount not reported. Their reported headache outcomes came from comparisons rather than evidence that treatment improves headache. For some other interventions, headache was simply recorded as an outcome, so the presence of a report should not be read as proof that the intervention caused every headache or that the risk applies equally to all users.
Choosing guidance
When comparing these options, first separate supplements from activities and exposures. Headache reports can arise through different shared pathways, including dehydration, heat, caffeine changes, exertion, neck positioning, breath holding, and vascular effects. This makes the circumstances around use as important as the name of the option itself.
Timing can help with interpretation, although it is not consistently reported. Some headaches are described during or after heat exposure, exercise, cold exposure, or treatment; others appear after starting an option, increasing the dose, or using it rapidly. Options used in more intensive ways, such as injections, intravenous administration, or systemic treatment, should not be compared directly with ordinary oral supplementation without considering the route and exposure pattern.
Clinical evidence includes randomized trials, systematic reviews, and meta-analyses, while other entries rely on pharmacology references, anecdotal reports, or theoretical explanations. These categories answer different questions and should not be treated as interchangeable. Clinical evidence is generally reported in people whose health status is not specified; the cold-plunge evidence specifically concerns healthy participants, so its relevance may be narrower.
Where studies do not establish a clear or consistent pattern, a headache report does not by itself show that an option caused it. A practical comparison therefore considers whether the option was new, whether use involved rapid escalation or an unusual route, and whether dehydration, heat, exertion, caffeine changes, or positioning could also explain the symptom. This approach is most useful for readers trying to distinguish a recurring pattern from an isolated report.