Muscle strain, muscle soreness. Cramps. If I swim too soon after eating, or if I do not do warm-up exercises then I might suffer cramps, especially in the stomach area, but also leg cramps, mainly in my calf muscles.
Inflammation is usually due to a disease (e.g. a cold or 'flu causes inflammation in the lungs and breathing passages), but inflammation too in joints (gout, arthritis, etc).
Swelling is usually due to a bruise or other impact trauma, so fluids congregate there to heal the tissues.
I don't exercise, so I can't give you more detail.