I've been having chest pain that sometimes feels like a sore muscle and sometimes it feels like mild stabbing pain and spreads to my shoulder and arms. I have a sore throat too and cough and nasal congestion for almost two weeks now, can it be the flu?

Doctor can examine. Throat pain in a teen can be from a strep throat (antibiotics needed), a cold or flu (antibiotics usually not used), or from some other cause such as allergies or irritants. Usually, a person sees the doctor if the sore throat is bothersome, recurrent, or doesn't go away quickly (mainly to look for strep). Occasional sharp chest pains may or may not be related to the throat, so a Dr. should check.
Many conditions . There are many conditions which may be associated with these symptoms. A strep and flu test at your physician’s office may help to guide therapy. Generally, upper respiratory infections may last for 7 to ten days. If there is sinus tenderness. Fever and / or green nasal discharge, a course of antibiotics may be prescribed by your physician.