Body aches during illness respond well to a combination of over-the-counter pain relievers, heat, hydration, and rest. Most of the achiness you feel when sick comes from your immune system, not the virus itself. Your body releases inflammatory chemicals called cytokines to fight infection, and those same chemicals make your muscles sore and sensitive. The good news: several simple strategies can take the edge off while your body does its work.
Why Being Sick Makes Everything Ache
When your immune system detects a virus, it floods your bloodstream with proteins that coordinate the fight against infection. These proteins trigger widespread inflammation, which is why body aches during a cold or flu feel so different from soreness after exercise. Instead of one muscle group hurting, everything hurts at once. The inflammation also lowers your pain threshold, making normal sensations feel more uncomfortable than they would on a healthy day.
Fever compounds the problem. When your body raises its internal temperature, your muscles contract and relax rapidly (sometimes as visible shivering), and that repetitive effort leaves them feeling wrung out. Dehydration from fever, sweating, or not drinking enough further stresses your muscles by disrupting the balance of minerals they need to function properly.
Over-the-Counter Pain Relievers
Acetaminophen (Tylenol) and ibuprofen (Advil, Motrin) both reduce body aches and fever, but they work differently. Acetaminophen acts primarily on pain signals in the brain, while ibuprofen reduces inflammation directly at the source. For widespread body aches during illness, either one helps, but ibuprofen may offer a slight edge because of its anti-inflammatory action.
For adults, acetaminophen is typically taken as 325 to 650 mg every four hours, or 500 mg every eight hours. Ibuprofen is taken as 200 to 400 mg every four to six hours, with a maximum of 1,200 mg per day unless a doctor advises otherwise. Neither should be used for more than 10 days without medical guidance. Avoid combining them with other products that contain the same ingredient, which is a common accidental overdose risk with acetaminophen since it’s hidden in many cold and flu formulas.
If you have kidney problems or stomach ulcers, acetaminophen is generally the safer choice. If you have liver issues or drink alcohol regularly, ibuprofen may be preferable. When in doubt, stick with whichever one you normally tolerate well.
Use Heat to Loosen Tight Muscles
A warm bath, heating pad, or warm compress can meaningfully reduce the stiffness and soreness that come with being sick. Heat brings more blood flow to the area where it’s applied, which helps flush out the chemical byproducts that build up in aching muscles. It also reduces muscle spasms and joint stiffness, both of which tend to worsen when you’re lying in bed for hours.
A warm (not hot) bath for 15 to 20 minutes is one of the most effective options because it treats your whole body at once. Adding Epsom salts is a popular choice, though the relief likely comes more from the warm water and relaxation than from magnesium absorption through the skin. If a bath feels like too much effort, a microwavable heating pad draped across your shoulders, lower back, or wherever aches concentrate works well. Keep heat sessions to about 20 minutes at a time to avoid irritating your skin.
Cold packs are better for acute injuries or localized swelling, but they’re not ideal for the diffuse aches of illness. If you have a fever and feel overheated, a cool washcloth on your forehead can feel soothing, but for muscle relief specifically, warmth is the better tool.
Stay Hydrated, and Add Electrolytes
Dehydration is one of the most overlooked reasons body aches feel worse during illness. When you’re sick, you lose fluids through sweat, fever, and sometimes vomiting or diarrhea. That fluid loss drains electrolytes like potassium and magnesium, both of which are essential for normal muscle function. Low levels of either one can cause muscle cramps, spasms, and weakness on top of the aches you’re already dealing with.
Water alone doesn’t replace those minerals. Electrolyte drinks, oral rehydration solutions (available at any pharmacy), or even broth-based soups provide the sodium, potassium, and fluid your muscles need. Coconut water is another option that’s naturally rich in potassium. Aim to sip steadily throughout the day rather than forcing large amounts at once, especially if your stomach is sensitive. If your urine is dark yellow, you’re behind on fluids.
Sleep Is Your Most Powerful Tool
Sleep doesn’t just help you recover faster. It directly changes how much pain you feel. Research from Harvard found that sleep deprivation causes a 120% increase in activity in the brain region that interprets pain intensity. At the same time, areas of the brain that normally dampen pain perception showed 60% to 90% less activity after poor sleep. In practical terms, a rough night makes every ache feel significantly worse the next day.
This creates a frustrating cycle: being sick disrupts your sleep, and disrupted sleep amplifies your pain. Even subtle changes in sleep quality, like waking up repeatedly during the night, are linked to increased pain sensitivity the following day. Breaking this cycle matters. Prioritize sleep by keeping your room cool, propping yourself up slightly if congestion is an issue, and taking a pain reliever before bed so discomfort doesn’t keep waking you. Daytime naps count too. Your immune system is most active during sleep, so every hour of rest is doing double duty: lowering your pain and fighting the infection.
Other Strategies That Help
Gentle stretching or light movement can relieve stiffness without taxing your body. You’re not trying to exercise. Just five minutes of slow stretching, focusing on your neck, back, and legs, can loosen muscles that have tightened from hours of lying down. If even that feels like too much, simply changing positions in bed every hour or so prevents muscles from locking up.
Loose, comfortable clothing matters more than you’d think. Tight waistbands and restrictive fabrics press on sensitive, inflamed muscles and can make aches feel worse. Soft layers you can add or remove as your temperature fluctuates will keep you more comfortable overall.
Massage or gentle pressure on sore areas can also provide temporary relief by increasing blood flow and reducing muscle tension. Even rubbing your own calves, forearms, or neck for a few minutes can help when aches feel diffuse and hard to target.
Signs That Need Medical Attention
Most body aches from a common illness resolve within a few days to a week. But certain combinations of symptoms suggest something more serious. The Mayo Clinic identifies several red flags that warrant immediate medical care: body aches paired with trouble breathing or dizziness, extreme muscle weakness that prevents you from doing routine daily activities, or a high fever with a stiff neck, which can signal meningitis.
You should also see a provider if you notice a rash alongside your aches (particularly a bullseye-shaped rash, which is characteristic of Lyme disease), if you’ve had a recent tick bite, or if your body aches persist well beyond the other symptoms of your illness. Lingering, unexplained muscle pain after an infection has cleared sometimes points to conditions that benefit from early treatment.