Pain in lower right side when getting up from bed or chair & sneezing and stretching. ?

Muscle strain: This sounds like it could be related to a muscle pull out strain. Stretching and exercising may help alleviate this discomfort. I hope this helps.

Sounds muscoluskel: What you describe sounds like an irritated or pulled muscle or bone connection. Costochondritis is from irritation of the cartilage and bone junction. Muscle strains can do this as well. Most get better slowly with time. But if it continues or gets worse, or you have other symptoms, be seen to check it out. If no reason to avoid them, meds such as tylenol (acetaminophen) or Ibuprofen can help.