Are heat packs harmful to the body?

Proper use of hand warmers generally does not pose a risk to health; however, improper use may lead to hazards such as skin allergies or burns. 1. Skin allergy: If the hand warmer is applied directly to the skin surface, the adhesive components on its surface may irritate the skin, causing allergic reactions such as itching, redness, swelling, or skin rashes. 2. Skin burns: During use, hand warmers continuously emit heat. Prolonged direct contact with the skin may cause burns, typically presenting as redness, swelling, or blistering of the skin. 3. Impact on fertility: If women apply hand warmers directly to the abdomen during menstruation, excessive heat may interfere with normal physiological functions and pose potential risks to the health of the ovaries and uterus. 4. Interference with monitoring: The heat generated by hand warmers may affect the accuracy of medical devices such as heart rate monitors or glucose meters if they are worn simultaneously.