How does Islam treat depression and sadness?
I am not depressed (al-Hamdulilah) but my friend is who I will not name here.
Concerning depression and sadness it can be due to various factors. We should visit a physician and take whatever medicine that is prescribed. Also among the many reasons for depression is the love of this world, dislike of death and concern of our sustainence. All these issues are perishables and out of our control. Rizq (sustainence) is predestined, death will befall all and this world will be left behind when we leave it. Rasulullaah :SAAWS: would always make this du’aa “ALLAHUMMAJ3AL QOETA AALI MUHAMMADIN KIFAATAN ” WHICH MEANS “Oh ALLAH make the provisions of the family of muhammed ( :SAAWS: ) sufficient.” And the best remedy for anxiety is dhikrullaah and constant rememberance of death. Let us make istighfaar in abundance. It will draw the mercy of ALLAH and also open the doors of our sustanence. ALLAH Ta’aala mentions “stagfiroo rabbakum innahu kana ghaffaaraa yur silis samaa’a alaykum miraara wayumdidkum bi amwaaliw wa baneena wa yaj3al lakum jan naatin wa yaj3al lakum an7aara”( Repent to your Lord for He is oft forgiving. He will send the skies in torrents on you and he will increase you in wealth and progeny and bless you with gardens and rivulets.) Let us inculcate the practise of dhikr, rememberance of death and constant Istighfaar.
And Allah knows best.