A learning disability is a permanent condition developing at the latest in early childhood, whereas mental illness (or a mental health problem) can develop at any time, and is not necessarily permanent. People can get better and resolve mental health problems with help and treatment.
Whilst mental health problems can be treated through therapy, social support, medication, or a combination of these, people with learning disabilities are not ‘treated’ but rather receive support which enables them to most effectively and happily lead their lives. Anyone can develop a mental health problem at any stage of their life, which means that they must be given the necessary support to deal with it, and ideally to prevent it from occurring at all.