Anyone can get this condition, but it is most common in young athletes, with there being a slightly higher incidence in females than males.
Is it treatable?
Yes. It is very treatable.
The first thing to do is get it properly assessed to ascertain which of the above is the cause of your specific problems.
In all cases, treatment will involve an exercise programme with / without postural taping of your kneecap, to re-align it and maintain it in its correct position.
You may need release and stretching exercises for other muscles affecting the area.
You will need strengthening exercises for certain muscle groups and you may be advised to do Core strengthening or pilates too.
You may also need orthotic insoles to correct the position of your foot if this is part of the problem.
