Corrosion on gutters can occur over time. This can cause leaks to start, create rusty spots, or cause seams to open up due to expansion and contraction. Additionally, this can cause moisture to seep into surrounding structures.

If your gutters are not preventing water from flowing down exterior walls to the ground below, you can have an issue. The build up of water seeping into the ground around the foundation can cause major issues and leaks in the basement.

If your gutters are sized too small, this means they won't be able to handle the volume of rainwater coming off your roof. This can lead to other issues, like leaking or water in the basement. If your gutters are overflowing during heavy rainfall, you need bigger gutters installed on your home.

Over time, gutters do deteriorate. The fasteners can come loose and they can start pulling away from the roof line. Possibly the weight of ice or leaf build up could have caused them to sag. Either way, this can cause drainage issue that can lead to other issues like leaks.

During heavy downpour, in-proper gutter drainage can cause soil erosion and landscaping to get washed out. Ensuring you have properly gutter drainage and water runoff is key to keeping you house looking great.  

Exposure to the sun can cause the color to fade on your gutters. Although they can be repainted, this often does not provide the same quality as the original product and typically, it is better value for your money to have them replaced.