In a new series of Inside Health Dr Mark Porter explores the growing initiative to 'deprescribe'. The last two decades have seen a dramatic increase in prescriptions and over the counter medication use with one third of people aged over 75 taking at least six medicines. Evidence suggests a person taking ten or more medicines is 3 times more likely to be admitted to hospital. Yet this is not just an issue in the elderly. Inside Health visits a children's ward with a new drug optimising service leading the way in appropriate prescribing for kids. Mark Porter investigates why such a huge number of people are on multiple medications and discusses the barriers to change with tips from leading experts trying to achieve a new approach.

Fiddling figures in research and why it matters that outcomes aren't switched or goal posts moved; involving parents in the care of premature babies to improve recovery; feedback on the current series

Why vaping is dividing public health experts causing a polarised split; prehabilitation before cancer surgery and the benefits of preparing for an operation; plus can hospital safety be compared to lessons learnt from the aviation industry?

Cannabidiol or CBD oil has had a recent surge in popularity but is there any evidence for it having any health benefits? Dr Margaret McCartney reviews the research. Mark visits the Dental psychology service at Guy's Hospital in London and talks to Tim Newton about dental phobia, the treatment available and how successful it is at treating a phobia which affects 1 in 10 people in the UK. Also what causes gout and why has advice changed on the best way to treat it? Mark talks to rheumatologist, Dr Tim Tait at United Lincolnshire hospitals.

Research suggests opioids don't work in long-term chronic pain but dispensing in the UK has risen four-fold since the nineties, and we consume more than any other country in Europe. There is a dearth of good evidence for how best to help people come off these drugs. Mark Porter meets the team trying to change that. And an objective pitch-side test that takes the guesswork out of diagnosing concussion.

Regulation of Home Fetal Heart Monitors prompted by concerns that the burgeoning use of these devices could be harmful. Deconditioning - there is a popular adage that spending 10 days in hospital can age people 10 years, but is this backed by evidence and could it actually be worse? Mark Porter visits Warwick Hospital to meet the team working to combat deconditioning in the elderly. Plus the Alcohol Harm Paradox - why do less affluent drinkers tend to develop more problems than their better off peers even if they drink exactly the same amount.

Dr Mark Porter investigates the digitisation of the NHS: are online, asynchronous GP consultations the future? He visits a GP surgery in Tower Hamlets to find out how patients are getting in touch online, in their own time. Does it help improve access for patients and manage workload for busy GPs?

Manu Vatish, an obstetrician from the University of Oxford, explains that currently every pregnant woman will be tested for pre eclampsia and how a new test could help accurately identify the 4% of women who actually get the condition.

And could aspirin help in the treatment of cancer? Mark talks to Professor Peter Elwood from Cardiff University about his recent study into the evidence and to Professor Janusz Jankowski, a gastroenterologist at Morecambe Bay hospital to talk about the implications and risk and benefits.

A new handheld device for migraine is being pioneered at Guys and St Thomas's Hospital in London. Using single pulses of transcranial magnetic stimulation the device is helping prevent and treat migraines in people who haven't responded well to other treatments. Dr Anna Andreou, director of headache research, and nurse specialist, Bethany Hill talk Mark through how it works.

Some people, particular of North European and Irish ancestry have the faulty genes that mean they are unable to get rid of excess iron in the body. This can lead to symptoms ranging from tiredness, joint pain, and diabetes to skin discolouring and liver disease. New research has shown the condition is far more common than has been previously thought and is often missed as a diagnosis. Haematologist at Gartnavel Hospital in Glasgow, Ted Fitzsimons and epidemiologist, David Melzer of the University of Exeter, talk testing and treatment for iron overload, or haemochromatosis.

Cancer is an umbrella term which covers a spectrum of disease. Some cancers, like lung cancer grow and spread rapidly. But others like some forms of breast, thyroid and prostate cancer have a less than 5% chance of progressing over twenty years. So should we redefine low risk cancers? GP Margaret McCartney and consultant histopathologist, Murali Varma of University Hospital of Wales in Cardiff discuss this question.

Genetics and confidentiality; a fascinating legal case where a woman is suing the hospital trust that looked after her father with Huntington's disease for not warning that she too could be affected. And a well established use of very low carb diets that isn't so well known - to treat complex childhood epilepsy. Plus cancer of the voice box and persistent sore throat. And should hairy arms be shaved for a hospital drip? This question has prompted a transatlantic spat when Sir Andy Murray posted a photograph after his recent hip operation.

Warnings that expensive, unproven 'add-ons' are being offered by IVF clinics ; Keen jogger Margaret McCartney asks whether rest helps running problems such as stitch, shin splints and plantar fasciitis. Plus DNA testing on the NHS to anyone prepared to pay for it with the results contributing to research. But what exactly is the aim of such testing and are there hidden implications?