Medical evidence-nexus

BVA Citation Nr: 0725282

Service connection may be granted for disability resulting 
from disease or injury incurred or aggravated during active 
military service. 38 U.S.C.A. §§ 1110, 1131 (West 2002); 38 
C.F.R. § 3.303. Service connection may also be granted for 
any injury or disease diagnosed after service, when all the 
evidence, including that pertinent to service, establishes 
that the disease or injury was incurred in service. 38 
C.F.R. § 3.303(d). Generally, service connection requires 
(1) medical evidence of a current disability, (2) medical 
evidence, or in certain circumstances lay testimony, of in-
service incurrence or aggravation of an injury or disease, 
and (3) medical evidence of a nexus between the current 
disability and the in-service disease or injury. See Caluza 
v. Brown, 7 Vet. App. 498 (1995). 

BVA Citation Nr: 0727382

Under VA laws and regulations, service connection will be 
granted if it is shown that a veteran has a disability 
resulting from an injury or disease contracted in the line of 
duty, or for aggravation of a preexisting injury or disease. 
38 U.S.C.A. §§ 1110, 1131; 38 C.F.R. §§ 3.303, 3.304. 
Service connection may also be granted for certain chronic 
diseases, such as a seizure disorder, when such disease is 
manifested to a compensable degree within one year of 
separation from service 38 U.S.C.A. §§ 1101, 1112, 1113, 
1137; 38 C.F.R. §§ 3.307, 3.309. Service connection may also 
be granted for any disease diagnosed after discharge, when 
all of the evidence, including that pertinent to service, 
establishes that a disease was incurred in service. 38 
C.F.R. § 3.303(d). Generally, to prove service connection 
the record must contain: (1) Medical evidence of a current 
disability, (2) medical evidence or in certain circumstances, 
lay testimony, of an in-service incurrence or aggravation of 
an injury or disease, and (3) medical evidence of a nexus 
between any current disability and the in-service disease or 
injury. Pond v. West, 12 Vet. App. 341 (1999); Caluza v. 
Brown, 7 Vet. App. 498 (1995).