<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, may I answer your health queries right now ? Please type your query here... hi my name is emmaly and I was wondering about my niece and that she has a runny nose sinus congestion green snot and a cough and I dont know what to do. She is so congested that it sounds like she is having trouble breathing. Could u help cause from the look of it, its looks like a sinus infection and allergies togther  <response>: Hi, I understand your query. Sinus infection is due to blockage of sinus outlet by allergic inflammation thick mucus plug... collected secretions in sinuses get infected to form sinusitis. The origin of all the symptoms being similar allergy,-congestion- infection there being anatomical connection between Throat-nose- sinus, common cold, sinusitis, throat lung involvements tend to follow each other seen all together. The breathing trouble can be due to congestion blocked nostrils Or allergic bronchitis A sufficient course of suitable antibiotic anti-inflammatory anti-allergic Chat Doctor. Thanks. 