Welcome to adwords community,
Can you please elaborate your query, so that community member will help you,
You are running a search network campaign, or display network campagin,
If you are running a search network campaign, check your status of campaign its aprrove or not.
If its approve then check your daily budget, its sufficent. or not.
Hello and welcome,
Further to what Suman said, when you hover mouse over the speech bubble of individual keyword, what message is shown to you? Does it say ad running or not?
Also, do you have the correct billing information updated inside the account?
I would also suggest you to run Ad Preview Tool to see whether your ads are displaying or not. This tool is for real time results and won't hamper your CTR, impressions etc...