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Most often it's iliotibial band syndrome or meniscus inflammation from overuse, especially if you suddenly increased your running load or you're running in bad shoes. Did you recently change your routes or training intensity?
Pain on the inside of the knee is often linked to medial meniscus syndrome or inflammation of the adductor muscles in the thigh - in 2026 orthopedists are recording such problems in roughly 40% of running enthusiasts, especially if there wasn't proper warm-up or there was a sudden increase in training volume. Someone above made a good point about shoes - I myself understand how important proper equipment is, just like when choosing gear for fishing, where even the smallest mistake leads to problems. Try reducing intensity by 20-30%, add stretching and strengthening exercises for the inner thigh, and if the pain doesn't go away in a week, you'd better see a physical therapist.
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