pain in muscles or joints sometimes experienced by children and often attributed to rapid growth

Unexplainable pain, usually in the legs, that occurs in growing children and is not accompanied by swelling or any other symptoms. Treatment includes massage and rest. The problem is distinguishing this pain from that caused by more serious problems: even physicians often have difficulty knowing how many laboratory and X-ray tests to perform.

intermittent aches or pains in legs that occur in the evening or at night occuring in children aged 3-12 years and may reoccur during puberty growth. (More? Child- Normal Development)

emotional distress arising during adolescence

problems that arise in enlarging an enterprise (especially in the early stages)