Dermology Aspirin No steroidal anti-inflammatory drugs Ibuprofen blood pressure medications (ACE inhibitors) or Analgesics such as codeine chronic urticaria and angioedema Hives lasting more than six weeks are called chronic. The cause of this type of hives is usually more difficult to identify than that of acute urticaria and the fact is still unknown in over 80 percent of patients. Chronic urticaria and angioedema can affect internal organs and can cause symptoms such as difficulty breathing, vomiting and diarrhea. It also can be caused by several other conditions such as: emotional stress Hot Exercise Chronic medical condition, such as hyperthyroidism, systemic lupus erythematosus, rheumatoid arthritis the pregnancy Physical urticaria this is the kind of hives caused by direct physical stimulation of the skin, such as cold, heat, sun exposure, vibration, pressure, sweating, exercise and others. 

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