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Loose tappets normally. They sit in the cylinder head on the rockers between the camshaft push-rods and the valves and are adjusted to bring the gap between the rocker and the valve to the manufacturers spec. Too much gap and the valves do not open properly, restricting fuel intake / exhaust gas purging. Too little gap and the valves will not close properly and can burn out. Mechanical tappets can be adjusted, hydraulic ones are eventually changed if the tapping gets too bad. There is a third type called bucket and shim but quite rare these days an the adjustment is complicated.
Less likely is a sticking valve; a condition where, for a number of reasons, a valve does not close properly leaving a big gap between the rocker and the valve with consequent ticking and normally a loss of power.
A:
An increasingly noisy ticking sound coming from your engine could indicate a lifter malfunction. I once had an exhaust valve lifter 'mushroom' where the cam makes contact with the flat tappet and the lifter wouldn't move up & down smoothly. This kept the exhaust valve from letting out the unspent fuel through the exhaust and the fuel had only one place to go: past the rings & into the oil. My cylinders needed rehoned.
It could be just a lifter gone bad. Unless you're into major HP(say over 400) you've probly got hydraulic lifters. This type builds up oil pressure to take up its 1/8" or so of slack they'll see when the engine hasn't recenlty run .
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