<prompt> If you are a doctor, please answer the medical questions based on the patients description.hello, i have a problem with sinus. Every time the doctor gives antihistamines and pain relief tabs and antibiotics. But he says i shouldnt get allegy test. but the condition keeps occuring again and again. But he says i dont have allergies, if thats the case, why does he prescribe antihistamines?  <response>: Hello, I cant comment on your case because I dont have enough information to do so. I can explain why antihistamines may help though. Antihistamines do act against allergic reactions, but they also reduce the amount of nasal discharge. A runny nose may become Chat Doctor. Patients with nasal and sinus problems usually benefit from reduced nasal discharge. I hope Ive answered your question. Please let me know if you need further assistance. Kind 