What diseases can an allergic constitution cause?

Allergic constitution may trigger various diseases, mainly including: 1. Allergic rhinitis: Symptoms include nasal congestion, runny nose, sneezing, etc., which can severely affect quality of life. 2. Allergic asthma: Symptoms may include wheezing, shortness of breath, chest tightness, etc., and in severe cases, it can be life-threatening. 3. Allergic skin diseases: Such as urticaria, eczema, atopic dermatitis, etc., manifested as skin redness, swelling, itching, rash, etc. 4. Allergic conjunctivitis: Red, itchy eyes, tearing, and even blurred vision. 5. Allergic gastrointestinal diseases: Such as allergic gastroenteritis, symptoms may include abdominal pain, diarrhea, vomiting, etc., and severe cases can lead to dehydration, acidosis, etc.