Aching neck (not stiff) in some mornings ,not all. lasts an entire day. pain radiates a little. left shoulder recently dislocated. what could it be?

Injury to neck: Any injury severe enough to dislocate a shoulder could certainly cause injury to the neck. Because the shoulder dislocation is very painful, the neck injury symptoms might be over looked. That is why when we examine someone for a shoulder injury we also SHOULD examine the neck (as the 2 are very intimately related). And vice versa. Please see your doctor re your neck symptoms.