Feeling Ill In Space

Space . . . is big. Really big. You just won't believe how vastly, hugely, mind-bogglingly big it is. You may think it's a long way down the road to the shops but that's just peanuts compared to space, our nearest neighbour is about 240,000 miles away and takes 3 days to get there so it was lucky the recent medical emergency happened aboard the International Space Station which is is 250 miles above our heads and only 24 hours away.
To protect the crew member’s privacy, Nasa hasn’t disclosed details about what happened but medical evacuations in Space are rare, this is the first time in 25 years, but the evacuation raises the question if we are looking for manned missions further out from the Earth?
A trip to Mars typically takes 6 to 9 months and coming back home if you are suffering a medical issue wouldn't be easy but Astronauts do undergo rigorous medical screening before selection for conditions that might worsen in microgravity of Space which could explain why the emergencies are so rare but what health issues occur in Space?  
The scientists at the European Space Agency have always been very helpful when I have Space type questions so I emailed them and asked the question to them and they were very quick to reply with an answer.
According to them skin irritation is the most frequently reported medical issue during spaceflight ranging from dry skin, rashes, hypersensitivity reactions and impaired wound healing  as the  cold, dry, low-humidity spacecraft environment exacerbates these problems.
Congestion and headaches affect most astronauts, particularly early in a mission as without gravity pulling fluids downward, blood shifts toward the head, causing a puffy face and 'space sniffles' as well as many Astronauts suffering from changes pressure in the eye, leading to optic nerve flattening and vision changes.
Sleep disruption is a thing as circadian rhythms are disrupted and musculoskeletal injuries are common, generally from the exercise designed to protect astronauts’ bones and muscles.
Watching returning Astronauts being carried away on stretchers after being on the ISS only reinforces my belief that if we do make it to Mars,  after 6-9 months of travelling, the astronauts would be in no fit state to do anything once they got there and nobody wil be waiting for them with a stretcher and a hospital to check them over.
Obviously if the boffins could come up with a Spaceship that duplicates the Earth's gravity then that would solve many of the problems but until then the sick astronaut has my sympathies because when you are not feeling at your best at work, there really is no place like home, shame it was whizzing 250 miles below them at 17,500 mph, 16 times a day.