Please choose the correct ending to complete the given sentence: Health: [header] How to know if you have a baker's cyst [title] Look for swelling in the area behind your knee. [step] This swelling is caused by fluid forming in the cyst, causing the area to become inflamed. The swelling will look like a bulge at the back of the knee and is best seen when you are standing up and your leg is straightened.

Ending1: [substeps] You can also tell if your knee is swollen by standing in front of a mirror and comparing it to your other knee. [title] Feel for any tightness behind your knee. Ending2: [substeps] Swelling can also occur when you are sitting or kneeling on a stool, performing jobs you are doing, or frequently wearing clothing to cover up during the day. [title] Try to avoid touching the area while you stand on the area. Ending3: [title] Determine if the cause of your cyst is an obstruction in the heart. [step] A cyst that sticks out of the blood stream or beneath the skin will cause swelling to the area. Ending4: The swelling will last for 3-5 days before leaving the kneecap. [substeps] The swelling around the cyst is due to fluid squeezing the cyst and pushing it through the skin.

Answer format: ending1/ending2/ending3/ending4