Different types of head traumas could obviously lead to dysfunctions that relate to what the afflicted brain area controls. In humans, the olfactory bulb is located on the inferior side of the brain. Physical damage to this area would alter how the area processes information in a variety of ways, but there are also other types of diseases that can alter how this area works. If the part of the brain that interprets these input signals is damaged, then a distorted output is possible. This would also lead to parosmia. Temporal lobe epilepsy has also led to cases of parosmia, but these were only temporary; the onset of parosmia was a seizure and it typically lasted a week or two after.  Parosmia is also a known symptom for Parkinson's disease , though not ubiquitous for patients with it, and although the specific pathway is undetermined, the lack of dopamine has resulted in documented cases of parosmia and phantosmia .