Join Date: Jun 2011
Location: Sunnyvale, California
Bikes: Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
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+1 on both.
I'll add that in some cases, the BB did work loose over a long period of time because it has become worn with minor pits in the bearing races or spindle depending on the type of BB you have. Tightening may not eliminate the problem or if it does, you may have to over tighten and this may interfere a little with the crank's ability to turn.
At the same time, check the pedals to see if cages are loose if you have caged pedals or perhaps the body is loose on the spindle.
And if you've been commuting, rust and grit can get into links pretty fast in the wet season and cause some links to get stiff. Clean and lube the chain too or if worn, replace it.