I've no doubt Bethesda are planning on releasing more DLC over time after Hearthfire, so in one of these I'd really enjoy more diseases to be added to the game as well as an addiction system like in Fallout (as an added bonus in a main DLC or in a free update). Things like this really help to immerse me in the game world so I was pretty disappointed to find out how few diseases there were in Skyrim compared to Oblivion and how few diseases there were in Oblivion compared to Morrowind. I also would like an addiction system for skooma, sleeping tree sap and for some new addictive drugs to be added into the game. I know Dawnguard added stronger Skooma with a drugged effect but still no addiction system. It's immersion breaking to hear people talk about how addictive skooma is and to help NPC's with their skooma addiction when you can't become addicted yourself.

The diseases we have at the moment should imo be the common, easily cured diseases, and there should be other tiers, such as rot from Draugr or some serious lurgi from Peryite's boys that require so much more than a simple potion or 'click the shrine'. Remember the pilgrimage in OB? Visit one wilderness shrine to each of the Nine sounds like a reasonable way to cure something a bit nastier. And serious effects, no stamina regeneration at all, rather than just a 25 point drain, for example.
On the other side of that coin, bring back cure (common) disease as a master Restoration Spell.

Mmmm, Morrowind had http://www.uesp.net/wiki/Morrowind:Diseases diseases, Oblivion http://www.uesp.net/wiki/Oblivion:Diseases. Just saying.

I personally don't think an addiction system is suited to TES. It suits Fallout (like weapon degrading) because those games are about survival, but I don't feel it would fit the Elder Scrolls games. Just my opinion anyway.

Skooma is addicting according to the Lore, there was just no ingame mechanism for the Addiction. Which always bugged me about this substance.

I think a DLC that answers the question where all those skooma dealers get supplied. An underground skooma cartel faction with its own questline would be awesome. Skooma addiction would be interesting, and it should be hard to break the addiction without months of time spent not using, all the while your withdrawal symptoms get worse and worse and then get gradually better and better as you spend more time not using. Having your own skooma lab and a supply of moon sugar to make it would be cool too. Then have addicts scattered all over skyrim willing to buy it. Make it so the dialog option only appears if you have skooma in your posession. There are a million things you could do with this.

Yes absolutely, I found the diseases far too easy to cure in Skyrim. There should certainly be more serious diseases that take a lot of effort to cure and that are rarer to catch. You're right about the amount of diseases in Oblivon, I always though it had much less than Morrowind as well.

Skyrim only has 7. Very disappointing.

Remember when Skooma wasn't just a stamina potion?
Good times...

Agreed, Skyrim should have more diseases. And they should worsen with time and lack of care, I think. Maybe even kill you, if you neglect them long enough.

I don't want them to be fatal, but certainly the effects should worsen over time without treatment. I'd hate to die of a disease that I didn't know I actually had or something like that, I just hate dying in general.

Yeah, I was so disappointed when I found my first bottle of Skooma in Skyrim and looked at it's effects. I remembered taking it in Oblivion and really feeling like it was a drug to the huge increase in speed.

+1 on Skooma addiction. Simple to do, too. Adverse effect (-20 to health, magicka, and stamina) until your next Skooma "hit", or 30 game days, after you "break the habit". WITH added adverse effect every time you actually see Skooma in the game (-20 magicka) and don't drink it, cumulative per game day, wears off after a week (or with cure common disease).

Diseases are tough, because they can hamper gameplay for some, like vampirism, cure it fast enough, cool, not fast enough, not so cool because the cure is long and sometimes glitchy as well. Common and rare diseases, A+. Common cures at a shrine, rare requires a shrine quest. Or, yes, bring back cure disease for Rest. Common for Common (adept level) Rare for Rare (master level).

I remember the first time my Oblivion mage caught Astral Vapours. 'What the hell is going on?', 'where's my magicka?', 'oh crap I need to run'. I haven't even noticed suffering from Skyrim diseases, except maybe Rockjoint and Rattles, until someone in town mentions the character not looking well.

And yeah, skooma used to damage intelligence, so some semi-permanent drain, perhaps to all three 'attributes' might be in order.

Yes and sometimes guards will check your inventory if you're under Skooma's effects and caught you if they found one.
That would be great addition.

Then in prison you're suffering from withdrawal. What would also be neat is if you caught diseases when being imprisoned, such as lung rot or something due to the stale air. I'd also really like to see proper prison sentences for crimes, 7 days for murder is just a bit ridiculous in my view. Should be at least 30 days.

I wish they would add in some cues that you are sick. Your character could cough or sneeze or moan when you are sick. I often don't notice when I've contracted a disease in a fight when there is a lot going on. I turn the hud opacity way down so it isn't easy to see. Since the effects of most diseases are pretty subtle, my first clue I've caught something is usually when I go to a town and someone says "you look awful, are you feeling alright?". Then I check my active effects and find out, "hey, this time I actually do have Ataxia".

Yes I felt same way... stamina potion thats a shame. Imo a better disease/addiction will be implemented alongside with the hardcoe mode - c'mom this is one of the most common requests from the community, just like the vamp thing, child adoption and house building. But that doesn't sound like a paid DLC, so maybe it will be available in a future patch, free... so the priority is low.

quiet you, i hate diseases in TES and usually go werewolf with all my characters just for the disease resist.
nothing annoys me more then being in the middle of a big dungeon/quest and getting some disease from a draugr or skeever

I wouldn't mind more diseases. Just not too many. Not in the way Morrowind did it, though. I'd rather it was how Oblivion did it. Just don't give freaking wolves vampirism. That doesn't even make sense by fantasy standards. I would rather Skyrim had diseases that could only be found in the Skyrim province. That would make it feel like it had a unique ecosystem of its own. I wouldn't mind the diseases of other provinces to pop up, but only ones that make sense. Stuff that is common in all provinces would be more ideal for diseases that can be found in other provinces.