Hello, I have been having this same exact problem as everyone described below. So, i will not describe it. I want everyone to instead post and lets see if we have something in common based on our daily lifestyles, routines, habits. I noticed ever since i got my first full time job as an accountant, this began. Currently i'm 25 years old and have been experiencing this for about 4 years. I personally think it has ALOT to do with posture. I used to drive to and from work, slouch at my desk, lay on the couch on my side when watching TV. I noticed i rarely have this problem when i spend the day outdoors walking. I used to be a swimmer, (butterfly/freestyle stroke). I used to lift fairly heavy in High school. was benching 225lbs at age 16. I also think it may be an injury from lifting back in the day, especially since i essentially stopped all physical activities. Also, I noticed it depends on the weather. Usually worse when its humid outside, and when i use air conditioning in the summer. Anyway, lets hear what others have to say.