A warm bath can help relieve COVID-19 body aches, but with an important caveat: if you have a fever, you should keep the water lukewarm rather than hot. Warm water eases muscle pain through several overlapping mechanisms, and most people with mild COVID can safely use it as part of home symptom management. The key is getting the temperature and timing right.
Why COVID Causes Body Aches
The widespread soreness you feel during COVID isn’t the virus directly attacking your muscles. It’s your immune system’s inflammatory response. When your body detects the infection, it releases a flood of signaling molecules called cytokines. These cytokines activate pain receptors throughout your body, creating that deep, all-over ache that makes even lying in bed uncomfortable. The same inflammatory process causes fatigue, headache, and joint pain. It’s essentially friendly fire from your immune system working overtime.
How Warm Water Reduces Pain
Warm water immersion works on pain through several pathways at once. The heat increases blood flow and oxygen delivery to sore muscles, which helps clear out inflammatory waste products that activate pain receptors. At the same time, the warmth and pressure of the water stimulate temperature and pressure sensors in your skin. These competing signals essentially crowd out pain signals, reducing how much soreness reaches your brain.
The water’s buoyancy also takes gravitational load off your joints and muscles, which is why getting into a warm bath often brings near-instant relief. Your muscles physically relax when they no longer have to fight gravity, and that relaxation alone reduces pain. Research on chronic pain conditions shows that water immersion can also reduce perceived fatigue by lowering overall nerve activity, something especially useful when COVID has left you exhausted and aching at the same time.
The Fever Problem
Here’s where it gets tricky. Hot water raises your core body temperature, which is exactly what you don’t want when you already have a fever. A fever of 101°F or 102°F isn’t dangerous on its own (body temperatures only become harmful above 108°F, which virtually never happens from illness alone), but adding external heat on top of a fever can make you feel significantly worse. You may become dizzy, nauseated, or lightheaded.
If you have an active fever, use lukewarm water instead of hot. Lukewarm means the water feels comfortable but not steamy, roughly around body temperature or slightly above. This still provides muscle relaxation and buoyancy benefits without pushing your temperature higher. Get out once the water starts cooling down, as sitting in cooling water can cause shivering, which actually raises your body temperature further.
Safety Risks to Watch For
Hot water causes your blood vessels to widen, which drops your blood pressure. When you’re healthy, your body compensates easily. When you’re fighting an infection, dehydrated, or running a fever, that blood pressure drop can cause dizziness or even fainting. This is most dangerous when you stand up to get out of the tub.
To reduce this risk:
- Sit on the edge of the tub for a few minutes after draining the water, letting your blood pressure normalize before standing.
- Keep water temperature moderate, especially if you feel weak or haven’t been eating and drinking well.
- Limit your time to 10 to 15 minutes. Longer soaks increase the cardiovascular strain.
- Drink water before and after. COVID and fever both dehydrate you, and hot water immersion adds to fluid loss through sweating.
- Skip the bath entirely if you’re experiencing chest pain, palpitations, significant shortness of breath, or severe dizziness. These symptoms suggest your cardiovascular system is already under stress.
Hot baths are specifically contraindicated for people with acute inflammatory conditions accompanied by fever, as well as those with unstable heart conditions or severe drops in blood pressure upon standing. If your COVID symptoms are primarily respiratory, with difficulty breathing or chest tightness, a bath adds risk without much benefit.
Getting the Most Relief
For typical mild COVID with body aches and low-grade fever, a lukewarm bath of about 10 to 15 minutes can meaningfully reduce pain and help you relax enough to sleep. You can combine it with over-the-counter pain relievers like acetaminophen or ibuprofen, which the CDC recommends as standard home treatment for mild COVID symptoms. The bath handles muscle tension and sensory pain relief, while the medication addresses the underlying inflammation.
If you don’t have a fever but still have lingering body aches, you can safely use warmer water. Many people recovering from COVID deal with muscle soreness for days after the fever breaks, and this is when a genuinely hot bath provides the most benefit with the least risk. The increased blood flow and deep muscle relaxation work best when your body isn’t already struggling to regulate its temperature.
A warm shower is a reasonable alternative if you’re concerned about dizziness or don’t trust yourself to get in and out of a tub safely while sick. You won’t get the buoyancy or hydrostatic pressure benefits, but the warm water on sore muscles still promotes relaxation and improved circulation. Consider placing a chair or stool in the shower if you feel unsteady.