<s>[INST] I am a 23  year old female.  Today I woke up and when I breathe in deeply I feel tightening on my chest , close to my collar bone.  My throat is also bothering me along with my left ear.  Im not sure if the chest pain is because I am developing a cold or it has to deal with my heart. [/INST] Howell come to ChatDoctorI really appreciate your concern, tightening here in your case could be due to muscular spasm, and it may not be due to any cardiac disease, in this young age and in female chest pain due to heart disease is not likely unless have some congenital disease, what the symptoms you mentioned it here could be muscular spasm and would be temporary if ever happening due to deep breathing spell and hope this information may help. </s>