This work aimed to determine some chemical compositions of cashew nut (anacardium occidentale). The concentration of heavy metals, antinutrients, physicochemical properties and polycyclic aromatic hydrocarbons (PAHs) were done using standard methods. Fresh cashew nut samples were collected in bags from Obukpa-Lejja in Nsukka, Enugu State, Nigeria. The cashew nut was fried in a litre of vegetable oil for 10 minutes for easy removal of the seeds from the pods. The data obtained shows that cashew nut contains heavy metals (Cadmium (0.0703 ± 0.0096 ppm), Lead (0.0773 ± 0.0047 ppm) and Mercury (0.8013 ± 0.0785 ppm)); Antinutrients such as Phytate (0.4307 ± 0.0720 mg/kg), Haemagglutinin (10.9522 ± 0.0751 mg/kg), Cardiac glycoside (33.9200 ± 0.1562 %), Oxalate (1.2998 ± 0.1110 mg/kg), Trypsin inhibitor (462.3670 ± 0.1528 mg/kg), Saponin (1.5300 ± 0.0173 %), and Tannin (0.7660 ± 0.0026 %) were present. PAHs present include Acenaphthylene (0.0017 ± 0.0003 µg/g), Fluoranthene (0.0033± 0.0058 µg/g), Phenanthrene (0.0005 ± 0.0002 µg/g), Xylene (0.0008 ± 0.0001 µg/g) and Benzo (b) fluoranthene (0.0013 ± 0.0002µg/g). The physicochemical properties include Acid value (3.4133 ± 0.0777 %), FFA (1.6763 ± 0.0021 %), Viscosity (1.7060 ± 0.0314 Pa.s), Density (0.9363± 0.0012 kg/m3), Saponification (372.4113 ± 0.0015 mg/kgKOH), Iodine value (97.3010 ± 1.1316 mg iodine/g), Peroxide value (31.3330 ± 0.5774Moleq/kg), Refractive index (1.4624 ± 0.0001), Smoke point (83.6670 ± 0.5774°C), Cloud point (104.3330 ± 0.5774°C) and Flashpoint (144.3330 ± 0.5774°C). When the levels of parameters like the antinutrients, heavy metals, physicochemical properties and PAHs exceed a certain level in the system they possess a deleterious effect on the system.