If any of these sound familiar, raise the alarm and head to the doc.

It’s a runner’s worst fear: you’re running when it suddenly feels as if something jumped up and bit you in the calf. You tore a muscle.

The good news is that with rest and rehab, you’ll be back on the road in no time. However, some injuries are not so obvious and can be trickier to treat — that nagging pain in your left glute or the ache in your right knee that starts 45 minutes into every run.

RELATED: Should I Wait And See Or Go Visit A PT?

How do you know when the injury is serious and requires a visit to a physical therapist? Ashleigh Bordwell, a PT at Rehab United in San Diego, offers six ways to determine when it is time to see a physical therapist.

1. Pain lingers after three or four days of resting and icing
2. Reoccurring dull pain
3. One traumatic event
4. Meds don’t control the pain
5. Pain is acute and sharp
6. Noticeable or visible changes