having twitches in your arms legs and sometimes shoulder also right hand seems to be bigger than left it has a weird feeling is this serious or something normal i am 13?

Muscle twitches (also known as muscle spasms or fasciculations) are common and usually nothing to worry about. They can occur anywhere in the body, including the arms, legs, shoulders, and hands. Muscle twitches can be caused by a variety of factors, such as stress, anxiety, caffeine intake, and dehydration. In most cases, muscle twitches will go away on their own.

However, if you are experiencing muscle twitches that are accompanied by other symptoms, such as muscle weakness, numbness, or tingling, it is important to see a doctor to rule out any underlying medical conditions.

Some possible causes of muscle twitches that may require medical attention include:

* Electrolyte imbalances: Low levels of potassium, calcium, or magnesium can cause muscle twitches.

* Nerve damage: Damage to the nerves that supply the muscles can cause muscle twitches.

* Medications: Some medications, such as steroids and antihistamines, can cause muscle twitches.

* Medical conditions: Certain medical conditions, such as thyroid disease and Parkinson's disease, can cause muscle twitches.

If you are concerned about your muscle twitches, talk to your doctor. They can help determine the cause of your muscle twitches and recommend treatment if necessary.