Classification Mental illness 70 International statistical classification of diseases and related health problems 68 Delusions 26 Schizophrenia 24 Psychoses 21 Schizophrenics 21 Diagnosis 10 Plants 10 Paranoia 8 Biology 7 Catatonia 7 Manic-depressive persons 7 Botany 6 Manic-depressive illness 5 Plantes 5 Biodiversity 4 Erotomania 4 Hypomania 4 Megalomania 4 Thought insertion 4 Biologie 3 Books 3 Classification (Sciences naturelles) 3 Congresses 3 Ecology 3 People with bipolar disorder 3 Phylogeny 3 Phytogeography 3 Anxiety disorders 2