When you catch a cold or the flu, it's not just a runny nose or fever; your whole body can ache, and muscle pain often accompanies these symptoms. This is commonly referred to as "cold body aches." But why do muscles hurt when you have a cold? Delving deeper, it is closely related to our body's immune response.

First, the substance called cytokine is key. When a virus enters the body, white blood cells respond first, releasing cytokines to summon other immune cells. Cytokines act as a kind of "alarm signal," and among them, inflammatory cytokines induce an inflammatory response in the process of fighting off the virus, causing pain in muscles and joints. In simple terms, muscle pain is not just caused by the virus; it is a byproduct of our body fighting the virus. Strong viruses like the flu can actually penetrate muscle cells, leading to much more severe muscle pain than a cold.

Another reason is the decreased oxygen supply to the muscles. When you catch a cold, you may have a fever and feel weak, which reduces the amount of oxygen delivered to the muscles. When oxygen is scarce, metabolic byproducts like lactic acid accumulate, worsening muscle pain.

Additionally, systemic fatigue from body aches cannot be overlooked. When an infection occurs, our body sends signals to 'not move and rest,' which can cause the muscles to become stiff or tense, making pain feel more intense. Moreover, when you have a cold, you may not sleep well and sweat a lot, leading to sleep deprivation and dehydration, which also contribute to worsening muscle pain.

So, how can we alleviate this muscle pain?

• Stay hydrated: Warm tea or electrolyte drinks can help.

• Get plenty of rest: Overexerting yourself can delay recovery.

• Apply heat: Warm compresses or hot packs are effective for pain relief.

• Use pain relievers: If necessary, you can take fever-reducing pain relievers like Tylenol.

Typically, muscle pain from a cold lasts about 3 to 5 days, but if the pain persists for more than a week, it may indicate another condition, so it's advisable to see a doctor. Ultimately, muscle pain from a cold is evidence that our body is fiercely fighting the virus and signals that rest is needed for recovery.