Squamous-cell carcinomas (SCCs),  also known as epidermoid carcinomas, comprise a number of different types of cancer that begin in squamous cells. These cells form on the surface of the skin, on the lining of hollow organs in the body, and on the lining of the respiratory and digestive tracts.Common types include:

Squamous-cell skin cancer: A type of skin cancer
Squamous-cell carcinoma of the lung: A type of lung cancer
Squamous-cell thyroid carcinoma: A type of thyroid cancer
Esophageal squamous-cell carcinoma: A type of esophageal cancer
Squamous-cell carcinoma of the vagina: A type of vaginal cancerDespite sharing the name "squamous-cell carcinoma", the SCCs of different body sites can show differences in their presented symptoms, natural history, prognosis, and response to treatment. By body location
Human papillomavirus infection has been associated with SCCs of the oropharynx, lung, fingers, and anogenital region. Head and neck cancer
About 90% of cases of head and neck cancer (cancer of the mouth, nasal cavity, nasopharynx, throat and associated structures) are due to SCC. Skin
Squamous cell carcinoma of the skin is the second most common skin cancer, accounting for over 1 million cases in the United States each year. Thyroid
Primary squamous-cell thyroid carcinoma shows an aggressive biological phenotype resulting in poor prognosis for patients. Esophagus
Esophageal cancer may be due to either esophageal squamous cell carcinoma (ESCC) or adenocarcinoma (EAC). SCCs tend to occur closer to the mouth, while adenocarcinomas occur closer to the stomach. Dysphagia (difficulty swallowing, solids worse than liquids) and painful swallowing are common initial symptoms.
Diagnosis
Although it is listed in the ICD-9 (306.2) and ICD-10 (F45.8) under "somatoform autonomic dysfunction", the term is no longer in common use by any medical agencies and has generally been superseded by more specific diagnoses. The orthostatic intolerance observed by Da Costa has since also been found in patients diagnosed with chronic fatigue syndrome, postural orthostatic tachycardia syndrome (POTS) and mitral valve prolapse syndrome. In the 21st century, this intolerance is classified as a neurological condition. Exercise intolerance has since been found in many organic diseases. Classification
There are many names for the syndrome, which has variously been called soldiers heart, cardiac neurosis, chronic asthenia, effort syndrome, functional cardiovascular disease, neurocirculatory asthenia, primary neurasthenia, and subacute asthenia. Da Costa himself called it irritable heart  and the term soldiers heart was in common use both before and after his paper. Most authors use these terms interchangeably, but some authors draw a distinction between the different manifestations of this condition, preferring to use different labels to highlight the predominance of psychiatric or non-psychiatric complaints. For example, Oglesby Paul writes that "Not all patients with neurocirculatory asthenia have a cardiac neurosis, and not all patients with cardiac neurosis have neurocirculatory asthenia." None of these terms have widespread use. Treatment
The report of Da Costa shows that patients recovered from the more severe symptoms when removed from the strenuous activity or sustained lifestyle that caused them.