You might think you know which diseases are the most harmful, but many are so rare that they don't get talked about...

via: EMGN

...which is a shame because they're plenty interesting. None of these disorders are necessarily life-threatening, but they could make life pretty interesting for the poor souls who have them. Learn about what it's like to turn blue, have your face just sorta cave-in, and or be cursed with an insatiable sexual appetite that can't be satisfied... ...then be glad you don't have the diseases that cause those things.

Systemic Capillary Leak Syndrome

via: EMGN

With this disorder, your capillaries start to leak plasma. With nowhere to go, it just swells up in your body. If left untreated this can be deadly, but you tend to notice it pretty quickly and doctors normally act in time. Three days after treatment, you're back to normal!

Alexia without Agraphia

via: EMGN

This literally means "being able to speak without being able to read." It generally happens after a stroke, which essentially kills certain parts of your brain that do jobs. In this specific one, you just forget how to read and often can't be re-taught. It generally lasts a lifetime and can really adversely affect people's lives, especially when they're younger.

Alien Hand Syndrome

via: EMGN

The name is funny. The reality is not. You literally can't control your hand, but that doesn't stop it from moving around. Sufferers have claimed that AHS has resulted in their own hand choking them, punching them, and ripping their clothes off. NOT fun.

A Chiari Malformation

via: EMGN

The specific problem occurs where the brain meets the spine. The malformation causes your brain to think that you're no longer a person who needs to sleep, so your brain doesn't shut down...ever. Imagine being up for twenty-four hours. Then imagine being up for twenty-four days. It reduces quality of life to almost zero, but fortunately treatment in the form of the removal of a bone in your vertebrae can fix the issue...before it's too late.

Hypersexuality

via: EMGN

Doesn't sound so bad, right? Wrong. You might think this is just an active interest in sex. It's not. It's a compulsion (just like many facets of OCD) that doesn't let you think about ANYTHING else until you get your sexual fix. It can come about after trauma, meaning one day you're mild-mannered, the next you're a sex-obsessed fiend with no interest in your old activities.

Jumping Frenchman of Maine

via: EMGN

Funny name, right? Well, this is actually kind of a funny disorder. In Maine in 1878, it was discovered that many French Canadian lumberjacks would yell effeminately at the mildest provocations. These big, burly men would also do almost anything you wanted as long as you YELLED the command at them. Doctors still don't know what caused this, but they did know it was real.

Permanent Sexual Arousal

via: EMGN

Sound like fun? Maybe climaxing uncontrollably would be nice for a minute or three, but this disorder doesn't go away. It's only been on the medical books since 2001, and while it might sound petty, people suffering from this complain that it interferes with every aspect of human interaction. One man had to contend with it at his father's funeral, calling it the worst day of his life. Like hiccups or sneezing, this doesn't go away and there's no known remedy.

Sleeping Sickness

via: EMGN

It starts off innocently enough. You feel a cold coming on and get exhausted. But after a few days, your body basically freezes, but...you're still awake. It was first noticed after the Spanish flu. You can die from this, but it's rare. However, those who recover are known to be physically and sexually aggressive for the rest of their lives, which is its own type of torment.

Wendigo Psychosis

via: EMGN

Have you ever wanted to become a zombie without that whole pesky "dying" thing? Well, this is your chance. This disorder makes you, for no particular reason, crave human flesh. Fortunately, no one has been known to act on the urge, but it's still freaky to know it's out there.

Argyria

via: EMGN

People with this disorder start carrying too much colloidal silver in their bodies, which causes them to turn blue like a Smurf. It's not life-threatening if you're treated, but the bad news? Once you're blue, you're blue for life. That's probably gonna end up being your "thing." You'll stand out on Tinder, though!

Parry-Romberg

via: EMGN

This doesn't look like fun, does it? The disorder causes your facial structure to collapse while discoloring skin. There's obviously no way to reverse it, but the issue can be managed with facial reconstruction, but it's terribly invasive and will never look completely the same. Strangely, the disorder tends to affect women at the end of their teenage years. I know there's no good time to have your face crash in, but you would at least hope it's later in life.