Why are my joints ceasing up when I workout? Im only 20?

Catie101
When I workout my butt e.g. doing squats, weighted squats, lunges etc. my knees cease up and it gets highly uncomfortable as if i have swelling around my joints. Im only 20 and i dont do them often because its so hard on me. what is going on and is there anything i can do/take to get rid of/help this discomfort?
Why are my joints ceasing up when I workout? Im only 20?
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