In any case, you need to seek the advice of a doctor.
Knee pain cannot be ignored lest the problem start. If knees hurt regularly or you experience discomfort in this area, this may indicate joint inflammation. In any case, you need to seek the advice of a doctor. But there are also several exercises that can help ease the condition at home. 
Hamstring Stretches
Starting position: lie on your back, stretch your legs, put your hands along your body. Lift one leg up, pull your thigh with your hands, trying to touch your knee to the abdomen. Change legs and repeat the exercise 5 times each.
Exercise for the kneecaps
Starting position: lie on your side. Bend your upper leg at the knee so that the heel touches the buttocks. You should feel tension in your upper thigh. Then turn over to the other side and repeat for the other leg - 10 repetitions each.Scissors
Starting position: sit on the floor, cross your legs at the calves. Place a small roller under your calves - this could be a rolled towel or even a bottle of water. Move the wepherd roller back and forth using only the calf muscles.
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