So yeah I worked out a bit just last week for like 30-40 minutes and did some running last week. The problem is after the periods of running I did (About 30mins at a time) I now have a pain in both legs, but mostly my left. This was a week ago since I was running and my knee has became swollen (left) I felt my muscle near to where my knee is on the top and around the side feels swollen or like a lump there that feels very sore and tender to the touch. I’ve never had this before and don’t know what it is. My left knee feels like it’s throbbing and causes me to limp a little I’m not limping as much today but it’s still very sore. It kinda hurts to get sit down and I have to sit in a certain position otherwise I feel pain from putting weight on my knee joint. The pain is from my knees (both but like I said mostly the left one) down to my ankles but the pain also happens in both of my thighs and upper leg area. Both are kinda swollen my left is the most swollen I dunno if it could be arthritis or not I’m young I’d like to know what it could be it really hurts when my knee is touched my family doesn’t have any history of cancer but I am still worried what it could be because it feels like a lump or a swollen muscle that hasn’t gone down even with ibuprofen it hasn’t gone down!