Difficulty concentrating or indecisiveness

Arabian man on the beach. Arabian man sitting on coastline. Space for copy

Liderina/Shutterstock

A loss of confidence can make decisions difficult: If you don’t trust yourself, how can you choose the right option? And continually battling self-doubt will also interfere with your concentration, according to Dr. Economu. If your inability to concentrate is due to depression—and statistics show that depression is now the leading cause of global mental and physical disability—your best option getting back on track is through a combination of psychotherapy and depression medication, research shows. This is how to tell the difference between depression and anxiety.