Medical Cannabis; Hidden Blood in the Urine; Ageing and Immunity - a podcast by BBC Radio 4

There are questions in Parliament following the story of 6 year old Alfie Dingley who was refused medical cannabis to help relieve his epileptic seizures. But what is the body of evidence for medical cannabis and does the reality live up to the hype? And age, immunity and the poor performance of this season's flu vaccine. Why do our defences decline as we get older and what can be done to improve vaccines that aim to protect the elderly against flu? Plus blood in your urine - pee the colour of Ribena is hopefully enough to drive anyone to their doctor - but what about tiny traces invisible to the naked eye frequently picked up by sensitive dipstick tests? If that has happened to you listen to our comprehensive guide.

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