What are the potential complications of a swollen left arm?

While some causes of arm swelling are minor, untreated or persistent swelling can lead to complications, such as:

Reduced range of motion: Ongoing swelling can make it difficult to bend or use the arm normally. Pain or stiffness: Swelling may increase discomfort over time, even if it starts out painless. Infection (cellulitis): Skin stretched by swelling can be more prone to infection, especially if there’s a break in the skin. Lymphedema progression: If caused by lymphatic blockage, swelling can become chronic and lead to hardening of the tissues. Blood clots (DVT): If a clot is the cause, there is a risk it could travel to the lungs. This can cause a pulmonary embolism, a serious condition where a clot blocks blood flow in the lungs. Nerve compression: Excess fluid or inflammation can press on nerves, causing tingling, numbness, or weakness. Skin breakdown or ulcers: Chronic swelling can impair skin health and healing, especially in older adults.

If your arm swelling is new, worsening, or persistent—especially with other symptoms like warmth, redness, or shortness of breath—it’s important to get medical attention to prevent complications.