Have you heard of Aphasia? It's a condition which affects speech and is usually caused by a stroke. 

Sarika speaks to Tamsin Mallion, The Stroke Association and Mohan who's brother Ravi had a stroke when he was 28. He hasn't been able to speak for 15 years. 

If you, or someone you know feels like you need support, the Stroke Association have a support platform where they can offer help and advice; https://www.stroke.org.uk/finding-support.