Are you physically active? Do you run a lot, walk, play football?
So you can struggle with such ailment as the antero-medial pain of the tibia, which begins during training (which cannot be dispersed), or after training. The name of this disease is shin splints, more precisely MTSS (Medial Tibial Stress Syndrome). The pain is dull, diffuse, stinging, not allowing the continuation of activity. The medial part of the lower leg is very tender, lumps may appear.
What is this caused by? As the name implies, this is an overload of the medial periosteum of the tibia due to muscular imbalance (it includes both the muscles of the lower leg as well as the thighs and torso), so this is a complex problem.
You should not underestimate such symptoms and make an appointment with a physiotherapist as soon as possible, who will thoroughly examine muscle tone and elasticity, choose the right therapy and show preventive exercises.