Early markers of arthritis include pain, stiffness, swelling, or redness in more than one joint that last for more than three days or occur more than a few times a month. However, having these symptoms in just one joint often indicates another issue, such as a strain or bursitis. There are also other conditions that mimic arthritis symptoms. The best way to find out if you have arthritis is to get a check-up from your healthcare provider—and sudden joint pain always warrants a visit.