Cold plunge safety & pre-plunge checklist
Reference guide for the cold plunge community. New Cold Nuts members confirm this checklist once at signup — bookmark this page to revisit it any time.
Not medical advice
Cold Nuts is a tracking app and community, not a medical service. Talk to a qualified healthcare provider before starting cold exposure, especially if any of the conditions below apply to you.
Breathwork & water — read this first
Breathing exercises that involve hyperventilation or breath holds (Wim Hof, box breathing, 4-7-8, breath retention, etc.) can cause shallow water blackout — a sudden loss of consciousness with no warning. People have drowned in pools, bathtubs, and cold plunges doing this.
- Never do breathwork in, on, or beside water — pool, tub, cold plunge, ocean, lake, or shower.
- Never hold your breath while submerged in cold water. The cold shock response already disrupts your breathing — adding a breath hold can lead to fainting and drowning.
- Do all breathwork on dry land, seated or lying down, well away from any body of water. Finish breathwork and recover fully before getting in.
- In the plunge, use slow controlled nasal breathing only. If you can't control your breath, get out.
Contraindications — do not plunge if any apply
Cardiovascular conditions
Uncontrolled high blood pressure, arrhythmias, recent heart attack, stroke, or known heart disease. Cold immersion spikes blood pressure and heart rate.
Raynaud's & cold urticaria
If your fingers/toes turn white in mild cold, or you break out in hives from cold, skip cold plunging entirely.
Pregnancy
The vasoconstriction and stress response are not recommended during pregnancy without explicit OB-GYN approval.
Epilepsy or seizure disorders
Cold shock can trigger episodes. Do not plunge unless cleared by a neurologist and never alone.
Open wounds, infections, or fresh tattoos
Cold water (especially open water or shared tubs) is a route to infection. Wait for full healing.
Under the influence
No alcohol, recreational drugs, or sedatives before a plunge. They blunt the shock response and your judgment.
Recent meal
Wait 60–90 minutes after a heavy meal to reduce nausea and vagal response risk.
Pre-plunge checklist
Run through this before every plunge — especially when you're new, plunging solo, or pushing into colder water.
Confirm every item above to continue.