How would taking in to much water be a disadvantage to a cell?

There are many disadvantages of consuming more water. It leads to recurrent attacks of cold and cough. It also increases the chances of arthritic pain, tend to increase body weight and loss of appetite.

The body cells or tissues absorb more water and tend to swell as much as 6 times of its own size.

When a cell itself takes on too much water, because it's in a hypotonic solution for example, the cell can literally explode.