Sarcopenia is actually a degenerative loss of skeletal muscle mass, efficiency and strength due to aging or lack of movement, and it is a disease that may be defined as any pathological or abnormal condition that affects muscle tissue, especially skeletal muscle, in which muscle weakness is the primary complaint, as a result of the inability of the affected muscles to perform their functions to the fullest extent. Therefore, muscle weakness or sarcopenia is a disease that affects muscle fibers, which leads to their inability to perform their function for several reasons, resulting in weakness in the muscle in general. Sarcopenia expresses a defect in the muscle itself, despite the efficiency of the nerve or nerves connected to it, and differs from problems that arise from a defect in the nerves or higher brain centers. Accordingly, muscle diseases can be classified according to their nature into two main categories: the first is neuromuscular disorders, which includes several types, and the second is what is known as the musculoskeletal motor type, while what is known as polymyositis can be considered a mixture of the two previous types. There was no specific and unified general medical definition for sarcopenia until 2009. A group of European doctors identified sarcopenia in the elderly and developed a general medical and diagnostic definition for age-related sarcopenia. Sarcopenia is diagnosed when there is a decrease in muscle mass and a decrease in motor ability. Sarcopenia or muscle weakness can be divided into several groups, some of which are hereditary, and some are acquired as a result of contracting another disease. The most famous of these are those that occur as a result of taking certain substances or medications, and some of which occur with some diseases, such as polio, and some of which occur with skin infections, as we will list as follows: As for doctors, the modern classification of sarcopenia is through the modern international classification, approved by the World Health Organization and known as the ICN - Codes, which we mean the international statistical classification of diseases and health problems, which includes more than 14,400 codes, which leads to many modern diagnoses of diseases, which then reach more than 16,000 codes. As for the symptoms of the disease, they can be summarized as a weakness in the person's or child's ability to use the affected muscles, and the matter may develop into repeated contractions, or muscle stiffness, and muscle spasms may occur. As for the treatment, because its causes are numerous and vary in the ways they occur, there is no comprehensive treatment method for all types, but it differs from one type to another. There are some types that benefit from some drug treatments, and some of them require physical therapy, and some of them require treatment with acupuncture, and recent research has begun to benefit from the system and science of stem cells to treat some types of this disease. However, periodic follow-up with the attending physician remains the most important thing in the subject, for several reasons, including knowing the development of the condition, and the extent of the effect of drug or physical therapy on not developing complications of the disease, as well as following up on all new modern treatment methods that may develop, which may benefit these patients. An accurate diagnosis of the type of atrophy or weakness of the meat is very important, because it is the first step in determining the type of treatment program appropriate for the case. It is known that a careful clinical examination by the examining physician of the patient is the first thread of diagnosis, through an accurate medical history and an accurate clinical examination. Then there is an initial laboratory examination of a specific enzyme. If its levels are high, we begin examining the affected muscles through electromyography. We may often need to perform a puncture operation on part of the affected muscles, to know the histopathological analysis of these tissues in the muscles, which allows for estimating the ideal treatment program for each case individually.