Negative thinking refers to a pattern of thinking negatively about oneself and ones surroundings. It can be a symptom of mental illnesses such as depression, anxiety disorders, personality disorders, and schizophrenia. Negative thinking can take many forms, including automatic negative thoughts (ANT) which are negative and random thoughts in reference to oneself. Negative thinking can seriously affect the way one thinks about oneself and the world, and even interfere with work, study, and everyday functioning.

There are many causes of negative thinking, including overanalyzing, indecisiveness, jumping to conclusions, and self-blame. Negative thinking can have consequences such as affecting ones relationships with others, decision-making, and overall health. Chronic stress and elevated levels of anxiety caused by negative thinking can lead to hypertension, persistent infections, digestive illnesses, and cardiovascular disease.

To reduce negative thinking, one can practice mindfulness, which is a technique used to help people focus on the present moment and restructure distorted thoughts and feelings. Studies suggest that mindfulness can reduce automatic negative thinking. Another way to reduce negative thinking is to challenge negative thoughts with other questions, such as "Am I really a bad person?". Its also important to be aware of ones shortcomings but have an internal voice of compassion. If negative thinking is seriously affecting ones life, its important to make an appointment to see a GP or seek practical information from mental health organizations.