This question does not have a yes or no answer. Some believe it is always a yes. The more accurate answer is sometimes yes and sometimes no.
1. Depression is not a result of sin when…your heart grieves over normal losses. The Bible says…“(There is) a time to weep…a time to mourn.” Ecclesiastes 3:4. Your body experiences natural deterioration due to the passing of years. Your body chemistry can change and be compromised. The Bible says,
“Outwardly we are wasting away, yet inwardly we are being renewed day by day.” 2 Corinthians 4:16
2. Depression can be a result of sin when…You are depressed over the consequences of your sinful actions, and you do not attempt to change. You do not take the necessary steps for healing (seeking biblical counseling, memorizing Scriptures, reading Christian materials, getting medical help when appropriate). You hold on to self-pity, anger, and bitterness when you have been wronged, instead of choosing to forgive.
“Anyone, then, who knows the good he ought to do and doesn’t do it, sins.” James 4:17
You use your depression to manipulate others. You continually choose to blame God and others for your unhappiness. You are depressed because you choose to let others control you instead of choosing to obey Christ and allow Him to be in control of you.