Increased thirst, frequent urination, fatigue, blurred vision, slow wound healing, and unexplained weight loss are symptoms of hyperglycemia, indicating high blood sugar levels often associated with diabetes. On the other hand, symptoms like sweating, shakiness, irritability, dizziness, confusion, and fainting point to hypoglycemia, signaling low blood sugar levels. Hyperglycemia can lead to complications such as cardiovascular disease and nerve damage, while severe hypoglycemia may result in seizures. Monitoring blood glucose levels and addressing underlying causes are crucial for managing these conditions and preventing complications.