Can I become Muslim if I have a mental illness?

Your shahada is valid

The conditions of becoming Muslim are sincere belief and saying the shahada while knowing what it means. A diagnosis doesn't cancel either. Many converts became Muslim while living with depression or anxiety, and some say faith helped them cope. The only situation where scholars speak of someone not being accountable is a complete loss of reason: the Prophet ﷺ said the pen is lifted from the insane until they recover (Sunan Abi Dawud 4403). That doesn't describe most mental illnesses.

Choose a calm moment

If your condition has acute episodes, like mania, psychosis or a severe crisis, it's wise to take your shahada when you feel stable and clear. That isn't because Islam doubts you. It's so you can look back on the decision with confidence. If you're well enough to read about it and think it through, you're well enough to decide. See Is it okay to wait before taking my shahada?

Islam doesn't blame you for being ill

Mental illness is not a sign of weak faith or a punishment. Prophets themselves felt deep grief, like Prophet Yaqub (Jacob) when he lost his son. The Prophet ﷺ said that no tiredness, illness, worry or sadness touches a believer, even a thorn's prick, except that Allah removes some of their sins because of it (Sahih al-Bukhari 5641). See Is depression a sign of weak faith in Islam?

Treatment and worship go together

• Keep taking your medication and seeing your doctor or therapist; follow your doctor's advice. Islam encourages treatment. See Can I take antidepressants as a Muslim?
• Prayer, dua and the Quran can support your recovery, but they don't replace medical care. See Should I get ruqyah or see a doctor for depression?
• Fasting and other duties can be eased or excused if they harm your health.
• If OCD makes wudu or prayer feel endless, tell an understanding imam; scholars advise ignoring repeated doubts.