Kleśa is a term from Indian philosophy and yoga, meaning a "poison". The third śloka of the second chapter of Patañjali's Yoga sūtras explicitly identifies Five Poisons: अविद्यास्मितारागद्वेषाभिनिवेशाः पञ्च क्लेशाः॥३॥

What do you mean by klesha?

Kleśa (sanskrit क्लेश, also klesha ) is a term from Indian philosophy and yoga, meaning a "poison".

Is anxiety a klesha?

Kleshas include states of mind such as anxiety, fear, anger, jealousy, desire, depression, etc. Contemporary translators use a variety of English words to translate the term kleshas, such as: afflictions, defilements, destructive emotions, disturbing emotions, negative emotions, mind poisons, neurosis etc.