Asthma attacks only in summer are generally considered to be caused by environmental factors, mental factors and dietary factors. 1. Environmental factors: summer itself is one of the hottest seasons of the year, and too much heat will lead to the body’s internal vagus nerve is easily excited, the neurotransmitters produced by the excited vagus nerve is likely to cause the bronchial tubes to contract abnormally, thus triggering asthma attacks. 2. Mental factors: too hot summer will lead to people’s emotional ups and downs fluctuation amplitude increased significantly, so do not rule out the possibility that asthma only in the summer adults and mental psychological factors. 3. Dietary factors: people in the hot summer is always especially favorite cold food, and asthma patients to eat this kind of food is likely to stimulate the respiratory tract, naturally will also trigger asthma. Summer allergens, such as grass pollen, tree pollen, the use of uncleaned air conditioning, mosquito repellent, humid and hot weather changes, may cause asthma, but regardless of their own season of attack, should be all aspects of timely treatment and care. If asthma is suspected, seek early medical attention.