Urticaria (hives) flare-ups are usually related to allergic reactions, physical irritants, or internal bodily changes, and the specific cause varies from person to person. It is recommended to keep a record of the environment, diet, and physical condition during an attack to help initially identify the trigger. If flare-ups are recurrent, a medical examination is necessary.
1. **Allergic factors:** In some individuals, exposure to pollen, dust mites, or consumption of seafood, nuts, or other foods may trigger an overreaction of the immune system, leading to skin welts and itching.
2. **Physical Stimulation**: When the skin is subjected to pressure, friction, changes in temperature, or sunlight, it may directly trigger a local rash. These conditions usually subside after the irritant disappears.
3. **Internal Influences:** Infections, emotional stress, or fatigue can cause fluctuations in the body's internal environment, indirectly causing symptoms. Some chronic conditions may also be related to other health problems.
In daily life, pay attention to wearing loose clothing and avoid known allergens. If symptoms are mild and temporary, you can observe them first; if the rash covers a large area, is accompanied by breathing difficulties, or recurs frequently, please consult a doctor promptly for professional diagnosis and treatment.
