Muscle weakness, or myasthenia, is a decrease in strength in one or more muscles. It is a common symptom of muscular, neurological and metabolic disorders. Muscular diseases, such as muscular dystrophy and dermatomyositis (disorder characterized by muscle inflammation), are common causes of muscle weakness.
Rating Newest Oldest. Best Answer: A doctor has a degree from medical school (4 years, either an MD or a DO) and has gone through residency (anywhere from 3 to 10 additional years of training). They are licensed to practice medicine or surgery (or both) independently, write prescriptions, etc.
by Admin. A nurse practitioner (NP) is a step above a registered nurse (RN), and is an individual who possesses either a Master of Science in Nursing degree or a Doctor of Nursing Practice degree in addition to an APRN (advanced practicing registered nurse) license and board certification.