causes for difficulty in breathing
Difficulty breathing is a common complaint and a tough diagnostic challenge, and there are some serious causes to be aware of. However, the great majority of mild and moderate cases, and even a few more serious ones, are probably caused by minor muscle knots (trigger points), respiratory dysfunction, and/or anxiety: all of which are relatively simple and cheap problems to try to self-treat.
In this case, shortness of breath may be the only warning sign you're having a heart attack. If you or your GP think this is the case, they'll give you aspirin and admit you to hospital straight away. Heart failure can also cause breathing difficulties.