Not every unusual issue associated with tomato plants poses a serious threat to the plant or tomato production. Here are three:
Common problems specific to tomatoes include blossom drop, blossom end rot, cracked or split fruit, and sunburned fruit. See GardenZeus Solutions to Common Abiotic Problems With Garden Tomatoes for more information.
Tomatoes may also be prone to chlorosis, nitrogen deficiency, shallow rooting and other common vegetable-plant issues in your zone. See The GardenZeus Guide to What Commonly Goes Wrong with Vegetable Plants in California Gardens for more information.
To view complete instructions for growing tomato in your area, go to GardenZeus and enter your zip code, then go to tomato.
Other articles regarding tomato that may be of interest:
Why Are Leaves on My Tomato Plants Turning Yellow?: Part 1 of 3
GardenZeus Tips for Fertilizing Tomatoes During the Growing Season