Distorted thoughts are emotional problems.
Distortions can be negative thoughts, irrational beliefs or illogical errors.

Abnormal behaviours occur if people engage in faulty thinking to the extent that it becomes maladaptive for them and others around them.

Keywords:
Polarised thinking = seeing everything in black or white
Over-generalisation = making sweeping generalisations
Tyranny of 'must', 'should and 'ought' = something must happen
Catastrophising = making a mountain out of a molehill