[46M] With swollen lump behind left knee

What might be happening

Based on the information you've provided, here are some possible explanations for your symptoms:

• Baker's Cyst (Popliteal Cyst): This is a fluid-filled swelling that develops behind the knee. It can cause a noticeable lump, pain, and stiffness. The cyst can sometimes burst, leading to swelling and redness in the calf.

  • Treatment often involves draining the cyst, physical therapy, and addressing any underlying knee issues.

• Deep Vein Thrombosis (DVT): This is a serious condition where a blood clot forms in a deep vein, usually in the leg. Symptoms can include swelling, pain, redness, and warmth. Given your description of sudden severe pain and muscle weakness, this is a possibility that needs urgent attention.

  • Treatment typically involves anticoagulant medications to prevent the clot from growing and breaking loose.

• Soft Tissue Infection (Cellulitis): This is an infection of the skin and tissues beneath it, which can cause redness, swelling, and tenderness. It can spread rapidly and requires prompt treatment.

  • Treatment involves antibiotics and sometimes drainage of any abscesses.

• Lipoma or Other Soft Tissue Tumor: These are generally benign growths of fat tissue that can cause a lump under the skin. They are usually not painful but can cause discomfort if they press on nerves or other structures.

  • Treatment may involve surgical removal if the lump is bothersome or growing.

What you can do

1. Seek Medical Attention: Given the severity and rapid progression of your symptoms, it's crucial to see a healthcare professional as soon as possible. They may perform imaging tests like an ultrasound or MRI to diagnose the issue.
2. Rest and Elevate: Keep your leg elevated to reduce swelling and avoid putting weight on it.
3. Apply Ice: Use an ice pack wrapped in a cloth to reduce swelling and pain. Apply for 15-20 minutes every hour.
4. Over-the-Counter Pain Relief: You can take over-the-counter pain relievers like ibuprofen or acetaminophen to help manage the pain.

What you should look out for

• Increased Pain or Swelling: If the pain or swelling worsens, seek immediate medical attention.
• Signs of Infection: If you develop fever, chills, or the redness spreads, this could indicate an infection that needs prompt treatment.
• Difficulty Breathing or Chest Pain: These could be signs that a blood clot has traveled to your lungs, which is a medical emergency.

Please remember that while this information can help guide you, it is not a substitute for professional medical advice. Make sure to consult a healthcare provider for a formal diagnosis and appropriate treatment.