Why would a left arm swell?

There are many possible causes for a swollen left arm, including:

* Injury: A fractured or dislocated bone, muscle strain or sprain, or other injury can cause swelling in the affected area.

* Infection: A bacterial or viral infection can cause inflammation and swelling in the affected area.

* Blood clot: A blood clot in a vein or artery can block blood flow to the affected area, causing swelling and pain.

* Lymphedema: A condition that occurs when lymph fluid builds up in tissues, causing swelling. Lymphedema can be caused by a variety of factors, including surgery, radiation therapy, or infection.

* Heart failure: When the heart is unable to pump blood effectively, fluid can build up in the body, including the arms and legs.

* Kidney disease: Kidney disease can cause fluid retention, leading to swelling in the arms and legs.

* Liver disease: Liver disease can cause a buildup of toxins in the body, leading to fluid retention and swelling in the arms and legs.

* Pregnancy: Hormonal changes during pregnancy can cause fluid retention, leading to swelling in the arms and legs.

It is important to see a doctor if you have a swollen left arm to determine the cause and receive appropriate treatment.