Many find it difficult to focus throughout the working day. In order to overcome this problem, German doctor Annette Fachendorf, member of the German Association of Physicians of Companies and Factories, advises you to take a break and go for a walk then come back and chat with your colleagues. This will help you concentrate again.
She also recommends that you drink a lot of fluids.
Other reasons for not concentrating could be that you did not sleep well the night before, too much stress or that you are thinking of too many things at the same time.
Edited translation from Al-Masry Al-Youm