Positives

• A Long COVID patient reported that Wim Hof breathing has consistently helped with fatigue, trouble breathing, and brain fog Reddit.
  
  
• A Long COVID patient described seeing “positive effects” from regular Wim Hof practice, even while acknowledging it could be coincidence and refusing to draw firm conclusions yet Reddit.
  
  
• A patient on r/covidlonghaulers said the practice is “very beneficial — long term it’s lowering stress and good for mental health,” framing it as a slow-burn rather than acute intervention Reddit.
  
  

Negatives

• A patient trapped in 12+ months of fight-or-flight reported that even before Wim Hof attempts she was unable to sleep at all because her body stayed perpetually activated, suggesting hyperventilation-style breathwork can backfire in severely sympathetic-dominant patients Reddit.
  
  

Hurdles & Side Effects

• Practitioners caution that Wim Hof rapid breathing simulates the body’s stress response and arouses the sympathetic nervous system; if a patient’s autonomic system cannot down-regulate afterward, they can become stuck in sympathetic arousal The Now.
  
  
• The Wim Hof Method’s own guidance warns to always practice in a safe environment because fainting is not uncommon, and never to practice in or around water or while driving Wim Hof Method.