Hi Dear , Welcome to HCM. Understanding your concern. Thanks for your query . There are some factors which are not in our hands like our environment , heat , cold , pressure and sun exposure . It is the bodies response to the trigger factor . Insect bite , pollen and some plants can also cause hives . The most important thing is to find the trigger factor . I would suggest you to give cold compresses to hives several times a day to prevent from swelling and itching and take over the counter antihistamine drug like benadryl. If symptoms still persist the consult dermatologist for proper examination and treatment . Doctor may perform skin test and challenge to find out the trigger factor . Doctor may prescribe other steroid cream ( mometasone) , anti inflammatory drug or drugs that can suppress immune system . Herbal tea and aloe vera gel are also very helpful . Stay in cool environment . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari