So many people I know are into running, whether they're trying to lose weight, reduce stress, or take part in a marathon. The problem is, there are many injuries related to the sport — runner's knee, pulled hamstrings, plantar fasciitis, and shin splints. While strength training and stretching are great ways to prevent an injury, sometimes getting hurt can't be avoided. It's hard to know the difference between a minor torn muscle and a more serious issue. So if you're suffering from pain, here are five ways to know you should see a doctor.

1. The pain wakes you up at night.
2. You alter your gait while running to ease the pain.
3. The pain is constant and you feel it when doing nonrunning activities, such as walking, biking, going up or down stairs, or sitting in the car.
4. The pain interferes with your day-to-day life.
5. You feel the pain while running and it lasts more than 10 to 14 days.

If you're experiencing any of these five, schedule an appointment to get a professional's opinion before your injury gets any worse.

Source