Reasons adsense accounts get disabled

There are hundreds of reasons a Google adsense account disabled message can appear. Two of the more common ones are:
1. Someone abusing your website. In other words, refreshing the page all day long and clicking your ads like there's no tomorrow. This causes your adsense stats to be inflated and is a form of fraud.
2. Your account undergoes a drastic change in ad impressions. I mean it has to be a huge change. I once had a change from 1,000 impressions per day to 15,000 the next and this caused no problems. But say for example you have been receiving 300 impressions per day growing at a steady pace for 6 months up to 1,000 impressions, then the following hour you receive 50,000 impressions in one hour. This can cause your adsense account to be "flagged" and disabled.

"But it's not my fault" I hear people saying

Your Google adsense account disabled? It's not the end of the world, because as is clear above, it's not always our fault that this happens. In fact sometimes we have no control over it at all.

How to get your account back

"Google adsense account disabled" does not mean that the account has been terminated for good. It also does not mean that Google hates you. You'll still be able to use GMail and other Google services, and it IS possible to re-instate your account.

1. E-mail Google.
2. E-mail Google again.
3. E-mail Google again after 1 month if there is still no response.

I have gotten through to Google Support on a number of occasions and I know from personal experience that people have gotten their account re-enabled after contacting Google and explaining the situation (with evidence and stats to back it up).
It might take 2 months or longer, but if it wasn't your fault (if you didn't breach the adsense TOS) the chances are you will get your account back.

Personal advice

Here is the Number 1 piece of personal advice I have to offer on this subject -

"Diversification of Passive Income"

1. Never depend on just a single source of passive income online. This is just not a good idea. Google adsense is not the single site that disables accounts for reasons such as the above. CJ, AdBrite, and almost all other ad serving companies have similar policies.
2. Create more income streams to minimise potential losses. Have at least 5 streams of income. If one goes down for a short or long period the losses are just 20% of the full income flow.
3. Have a back-up plan.