Those that have an interest in Tibetan Buddhism eventually come into the infamous “lung”, which is an imbalance in the subtle energy that can affect one adversely. Tsoknyi Rinpoche gives an explanation about lung, as well as one can work with it
Q: A certain amount of lung is a normal part of the subtle body. But there are also disturbances in the wind energy. Is it possible that lung disturbances can get intensified through meditation practice and manifest negatively at the level of feelings?
Rinpoche: Clearly, yes. In anything we do, whether during meditation or in any situation, lung can be intensified. This can happen when we feel overloaded and “stressed out” or when our emotions get quite strong, even overwhelming. Any practice we do driven by the wish to perform well or succeed with a corresponding lack of relaxation and lightness increases this intensity and creates restlessness. I am speaking here about the attitude of a forced, driven, goal-oriented practice. To take one example, if you want to quickly recite 100,000 mantras within a few days this may cause what we call lung, a disturbance in the energy, because you have unnaturally put yourself under too much pressure.