Anything described as increased has become bigger or more numerous. After an increased amount of rain, there could be flooding. A person riding a motorcycle without a helmet has an increased risk of bonking her head.
To increase something is to make more of it. Therefore, anything described as increased has expanded in some way. If there's increased paranoia, there's more paranoia. If there's increased unemployment, unemployment has gone up. If there's increased obesity, more people are obese. The opposite of this word is decreased. Decreased employment and increased unemployment mean the same thing. Tricky!