Gout occurs due to accumulation of uric acid/lactic acid.

Explanation

**Step-by-Step Solution:**

1. **Understanding Gout**: Gout is a type of arthritis that causes severe pain, redness, and tenderness in the joints. It is often referred to as gouty arthritis.

2. **Identifying the Cause**: The primary cause of gout is the accumulation of uric acid in the body. When uric acid levels become too high, it can lead to the formation of crystals that deposit in the joints.

3. **Effects of Uric Acid Crystals**: These uric acid crystals cause inflammation and pain in the joints, leading to the characteristic symptoms of gout, such as swelling and tenderness.

...