An injured plaintiff must bring a lawsuit within a certain period of time after harm occurred -- under laws called statutes of limitations. In toxic tort cases, many plaintiffs don't discover their injuries until many years after the harm occurred, because symptoms often take years to show up. Luckily, the courts follow the "discovery rule," which means the clock doesn't start ticking on the statute of limitations time period until the plaintiff actually discovers the harm. If you just recently became ill from your exposure to a dangerous chemical, meaning you just discovered that the chemical harmed you, it is probably not too late to sue. Contact a lawyer immediately. To learn more about statutes of limitations in toxic tort cases, see Nolo's article Toxic Tort Litigation: Common Defenses.