Feeling itchy when you get hot is often caused by your body's response to increased temperature and sweating. Heat and sweat can lead to blocked sweat glands or irritation, which then triggers itchiness on the skin.

Sweat and Skin Irritation

When you heat up, your body sweats to help regulate temperature. Sweat on the skin mixes with bacteria and dead skin cells, which can lead to irritation or mild inflammation. Sometimes sweat gets trapped under the skin, either because of blocked pores or excessive sweating, which increases inflammation and the sensation of itching.

Heat Rash and Prickly Sensations

A common cause is heat rash or "prickly heat" (miliaria). This occurs when sweat ducts become blocked and sweat gets trapped under the skin, causing red, itchy bumps or a prickly, tingling feeling. It typically affects areas where sweat accumulates, such as your armpits, chest, back, and groin.

Other Possible Reactions

Some people experience a condition called cholinergic urticaria, which causes hives and itchiness when exposed to heat, exercise, stress, or spicy foods. This is essentially an allergic-like reaction triggered by increased body temperature or sweating.

Tips for Relief

• Wear loose, breathable clothing to help sweat evaporate.
• Shower after sweating to remove bacteria and dead skin cells.
• Use mild cleansers and avoid harsh soaps.
• Stay hydrated and avoid overheating when possible.

If your itching is persistent, severe, or associated with other symptoms, consider consulting a healthcare professional to rule out underlying conditions.