Sudden budget spikes are usually due to high-competition keywords or broad match types. Start by checking your search terms report to see what’s driving unnecessary clicks. If certain keywords are eating up your budget but not converting, lower bids or pause them. Broad match can also pull in irrelevant traffic, so use phrase or exact match instead. Setting ad schedules can help control costs during off-peak hours. For more tips, has a great section on managing budget fluctuations and optimizing spend efficiently. Trust me, taking a close look at keyword performance makes all the difference.